sdpisolver_sdpa.cpp

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/* This file is part of SCIPSDP - a solving framework for mixed-integer      */
/* semidefinite programs based on SCIP.                                      */
/*                                                                           */
/* Copyright (C) 2011-2013 Discrete Optimization, TU Darmstadt               */
/*                         EDOM, FAU Erlangen-Nürnberg                       */
/*               2014-2017 Discrete Optimization, TU Darmstadt               */
/*                                                                           */
/*                                                                           */
/* This program is free software; you can redistribute it and/or             */
/* modify it under the terms of the GNU Lesser General Public License        */
/* as published by the Free Software Foundation; either version 3            */
/* of the License, or (at your option) any later version.                    */
/*                                                                           */
/* This program is distributed in the hope that it will be useful,           */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of            */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             */
/* GNU Lesser General Public License for more details.                       */
/*                                                                           */
/* You should have received a copy of the GNU Lesser General Public License  */
/* along with this program; if not, write to the Free Software               */
/* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.*/
/*                                                                           */
/*                                                                           */
/* Based on SCIP - Solving Constraint Integer Programs                       */
/* Copyright (C) 2002-2017 Zuse Institute Berlin                             */
/* SCIP is distributed under the terms of the SCIP Academic Licence,         */
/* see file COPYING in the SCIP distribution.                                */
/*                                                                           */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/* #define SCIP_DEBUG*/
/* #define SCIP_MORE_DEBUG   *//* shows all added nonzero entries */
/* #define SCIP_DEBUG_PRINTTOFILE  *//* prints each problem inserted into SDPA to the file sdpa.dat-s and the starting point to sdpa.ini-s */

/* #define SDPA_RESETPARAMS */ /* this can be used together with an update to the SDPA source code to prevent memory leaks when using SCIP-SDP with SDPA */

/* turn off lint warnings for whole file: */
/*lint --e{750,788,818}*/

#include <assert.h>

#include "sdpi/sdpisolver.h"

/* turn off warnings for sdpa (doesn't seem to work) */
#pragma GCC diagnostic ignored "-Wstrict-prototypes"
#include "sdpa_call.h"                       /* SDPA callable library interface */
#pragma GCC diagnostic warning "-Wstrict-prototypes"

#include "blockmemshell/memory.h"            /* for memory allocation */
#include "scip/def.h"                        /* for SCIP_Real, _Bool, ... */
#include "scip/pub_misc.h"                   /* for sorting */
#include "sdpi/sdpsolchecker.h"              /* to check solution with regards to feasibility tolerance */

/* local defines */
#define GAPTOLCHANGE                1        
#define FEASTOLCHANGE               1        
#define PENALTYBOUNDTOL             1E-3     
#define INFEASFEASTOLCHANGE         0.1      
#define INFEASMINFEASTOL            1E-9     
#define MIN_LAMBDASTAR              1e0      
#define MAX_LAMBDASTAR              1e8      
#define LAMBDASTAR_FACTOR           1e0      
#define LAMBDASTAR_TWOPOINTS        TRUE     
#define LAMBDASTAR_THRESHOLD        1e1      
#define LAMBDASTAR_LOW              1.5      
#define LAMBDASTAR_HIGH             1e5      
#define MIN_PENALTYPARAM            1e5      
#define MAX_PENALTYPARAM            1e12     
#define PENALTYPARAM_FACTOR         1e1      
#define MAX_MAXPENALTYPARAM         1e15     
#define MAXPENALTYPARAM_FACTOR      1e6      
#define BMS_CALL(x)   do                                                                                     \
                      {                                                                                      \
                         if( NULL == (x) )                                                                   \
                         {                                                                                   \
                            SCIPerrorMessage("No memory in function call.\n");                               \
                            return SCIP_NOMEMORY;                                                            \
                         }                                                                                   \
                      }                                                                                      \
                      while( FALSE )

#define CHECK_IF_SOLVED(sdpisolver)  do                                                                      \
                      {                                                                                      \
                         if (!(sdpisolver->solved))                                                          \
                         {                                                                                   \
                            SCIPerrorMessage("Tried to access solution information for SDP %d ahead of solving!\n", sdpisolver->sdpcounter);  \
                            return SCIP_LPERROR;                                                             \
                         }                                                                                   \
                      }                                                                                      \
                      while( FALSE )

#define CHECK_IF_SOLVED_BOOL(sdpisolver)  do                                                                 \
                      {                                                                                      \
                         if (!(sdpisolver->solved))                                                          \
                         {                                                                                   \
                            SCIPerrorMessage("Tried to access solution information for SDP %d ahead of solving!\n", sdpisolver->sdpcounter);  \
                            return FALSE;                                                                    \
                         }                                                                                   \
                      }                                                                                      \
                      while( FALSE )


struct SCIP_SDPiSolver
{
   SCIP_MESSAGEHDLR*     messagehdlr;        
   BMS_BLKMEM*           blkmem;             
   BMS_BUFMEM*           bufmem;             
   SDPA*                 sdpa;               
   int                   nvars;              
   int                   nactivevars;        
   int*                  inputtosdpamapper;  
   int*                  sdpatoinputmapper;  
   SCIP_Real*            fixedvarsval;       
   SCIP_Real             fixedvarsobjcontr;  
   int                   nvarbounds;         
   int*                  varboundpos;        
   SCIP_Bool             solved;             
   SCIP_Bool             timelimit;          
   int                   sdpcounter;         
   int                   niterations;        
   int                   nsdpcalls;          
   SCIP_Real             epsilon;            
   SCIP_Real             gaptol;             
   SCIP_Real             feastol;            
   SCIP_Real             sdpsolverfeastol;   
   SCIP_Real             objlimit;           
   SCIP_Bool             sdpinfo;            
   SCIP_Bool             penalty;            
   SCIP_Bool             rbound;             
   SCIP_SDPSOLVERSETTING usedsetting;        
   SCIP_Real             lambdastar;         
};


/*
 * Local Functions
 */

#ifndef NDEBUG

static
SCIP_Bool isFixed(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real             lb,                 
   SCIP_Real             ub                  
   )
{
   assert( sdpisolver != NULL );
   assert( lb < ub + sdpisolver->feastol );

   return (ub-lb <= sdpisolver->epsilon);
}
#else
#define isFixed(sdpisolver,lb,ub) (ub-lb <= sdpisolver->epsilon)
#endif

static
SCIP_RETCODE checkFeastolAndResolve(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real             penaltyparam,       
   int                   nvars,              
   SCIP_Real*            lb,                 
   SCIP_Real*            ub,                 
   int                   nsdpblocks,         
   int*                  sdpblocksizes,      
   int*                  sdpnblockvars,      
   int                   sdpconstnnonz,      
   int*                  sdpconstnblocknonz, 
   int**                 sdpconstrow,        
   int**                 sdpconstcol,        
   SCIP_Real**           sdpconstval,        
   int                   sdpnnonz,           
   int**                 sdpnblockvarnonz,   
   int**                 sdpvar,             
   int***                sdprow,             
   int***                sdpcol,             
   SCIP_Real***          sdpval,             
   int**                 indchanges,         
   int*                  nremovedinds,       
   int*                  blockindchanges,    
   int                   nlpcons,            
   int                   noldlpcons,         
   SCIP_Real*            lplhs,              
   SCIP_Real*            lprhs,              
   int*                  rownactivevars,     
   int                   lpnnonz,            
   int*                  lprow,              
   int*                  lpcol,              
   SCIP_Real*            lpval,              
   SCIP_Real*            feastol             
   )
{
#ifdef SCIP_DEBUG
   char phase_string[15];
#endif

   assert( feastol != NULL );

   while ( SCIPsdpiSolverIsAcceptable(sdpisolver) && SCIPsdpiSolverIsDualFeasible(sdpisolver) && penaltyparam < sdpisolver->epsilon && *feastol >= INFEASMINFEASTOL )
   {
      SCIP_Real* solvector;
      int nvarspointer;
      SCIP_Bool infeasible;

      /* get current solution */
      BMS_CALL( BMSallocBufferMemoryArray(sdpisolver->bufmem, &solvector, nvars) );
      nvarspointer = nvars;
      SCIP_CALL( SCIPsdpiSolverGetSol(sdpisolver, NULL, solvector, &nvarspointer) );
      assert( nvarspointer == nvars );

      /* check the solution for feasibility with regards to our tolerance */
      SCIP_CALL( SCIPsdpSolcheckerCheck(sdpisolver->bufmem, nvars, lb, ub, nsdpblocks, sdpblocksizes, sdpnblockvars, sdpconstnnonz,
            sdpconstnblocknonz, sdpconstrow, sdpconstcol, sdpconstval, sdpnnonz, sdpnblockvarnonz, sdpvar, sdprow, sdpcol, sdpval,
            indchanges, nremovedinds, blockindchanges, nlpcons, noldlpcons, lplhs, lprhs, rownactivevars, lpnnonz, lprow, lpcol, lpval,
            solvector, sdpisolver->feastol, sdpisolver->epsilon, &infeasible) );

      BMSfreeBufferMemoryArray(sdpisolver->bufmem, &solvector);

      if ( infeasible )
      {
         SCIPdebugMessage("Solution feasible for SDPA but outside feasibility tolerance, changing SDPA feasibility tolerance from %f to %f\n",
               *feastol, *feastol * INFEASFEASTOLCHANGE);
         *feastol *= INFEASFEASTOLCHANGE;

         if ( *feastol >= INFEASMINFEASTOL )
         {
            /* update settings */
            sdpisolver->sdpa->setParameterEpsilonDash(*feastol);

#ifdef SCIP_MORE_DEBUG
            sdpisolver->sdpa->printParameters(stdout);
#endif
            sdpisolver->sdpa->setInitPoint(false);
#ifdef SDPA_RESETPARAMS
            sdpisolver->sdpa->resetParameters();
#else
            sdpisolver->sdpa->initializeSolve();
#endif
            sdpisolver->sdpa->solve();

            /* update number of SDP-iterations and -calls */
            sdpisolver->niterations += (int) sdpisolver->sdpa->getIteration();
            sdpisolver->nsdpcalls += 1;

#ifdef SCIP_DEBUG
            /* print the phase value , i.e. whether solving was successfull */
            sdpisolver->sdpa->getPhaseString((char*)phase_string);
            SCIPdebugMessage("SDPA solving finished with status %s (primal and dual here are switched in contrast to our formulation)\n", phase_string);
#endif
         }
         else
         {
            sdpisolver->solved = FALSE;
            SCIPmessagePrintInfo(sdpisolver->messagehdlr, "SDPA failed to reach required feasibility tolerance! \n");
         }
      }
      else
         break;
   }
   return SCIP_OKAY;
}

/*
 * Miscellaneous Methods
 */

const char* SCIPsdpiSolverGetSolverName(
   void
   )
{/*lint !e1784*/
   return "SDPA"; /* version number can only be printed to file/stdout */
}

const char* SCIPsdpiSolverGetSolverDesc(
   void
   )
{/*lint !e1784*/
   return "Primal-dual Interior Point Solver for SDPs developed by K. Fujisawa et al. (sdpa.sourceforge.net)";
}

void* SCIPsdpiSolverGetSolverPointer(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   return (void*) sdpisolver->sdpa;
}

SCIP_Real SCIPsdpiSolverGetDefaultSdpiSolverFeastol(
   void
   )
{
   return 1E-6;
}

int SCIPsdpiSolverGetDefaultSdpiSolverNpenaltyIncreases(
   void
   )
{
   return 2;
}

/*
 * SDPI Creation and Destruction Methods
 */

SCIP_RETCODE SCIPsdpiSolverCreate(
   SCIP_SDPISOLVER**     sdpisolver,         
   SCIP_MESSAGEHDLR*     messagehdlr,        
   BMS_BLKMEM*           blkmem,             
   BMS_BUFMEM*           bufmem              
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   assert( blkmem != NULL );
   assert( bufmem != NULL );

   SCIPdebugMessage("Calling SCIPsdpiCreate \n");

   BMS_CALL( BMSallocBlockMemory(blkmem, sdpisolver) );

   (*sdpisolver)->messagehdlr = messagehdlr;
   (*sdpisolver)->blkmem = blkmem;
   (*sdpisolver)->bufmem = bufmem;

   /* this will be properly initialized then calling solve */
   (*sdpisolver)->sdpa = NULL;

   (*sdpisolver)->nvars = 0;
   (*sdpisolver)->nactivevars = 0;
   (*sdpisolver)->inputtosdpamapper = NULL;
   (*sdpisolver)->sdpatoinputmapper = NULL;
   (*sdpisolver)->fixedvarsval = NULL;
   (*sdpisolver)->fixedvarsobjcontr = 0.0;
   (*sdpisolver)->nvarbounds = 0;
   (*sdpisolver)->varboundpos = NULL;
   (*sdpisolver)->solved = FALSE;
   (*sdpisolver)->timelimit = FALSE;
   (*sdpisolver)->sdpcounter = 0;
   (*sdpisolver)->niterations = 0;
   (*sdpisolver)->nsdpcalls = 0;

   (*sdpisolver)->epsilon = 1e-9;
   (*sdpisolver)->gaptol = 1e-4;
   (*sdpisolver)->feastol = 1e-6;
   (*sdpisolver)->sdpsolverfeastol = 1e-6;
   (*sdpisolver)->objlimit = SCIPsdpiSolverInfinity(*sdpisolver);
   (*sdpisolver)->sdpinfo = FALSE;
   (*sdpisolver)->usedsetting = SCIP_SDPSOLVERSETTING_UNSOLVED;

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverFree(
   SCIP_SDPISOLVER**     sdpisolver          
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   assert( *sdpisolver != NULL );

   SCIPdebugMessage("Freeing SDPISolver\n");

   /* free SDPA object using destructor and free memory via blockmemshell */
   if ( (*sdpisolver)->sdpa != NULL)
      delete (*sdpisolver)->sdpa;

   BMSfreeBlockMemoryArrayNull((*sdpisolver)->blkmem, &(*sdpisolver)->varboundpos, 2 * (*sdpisolver)->nactivevars); /*lint !e647*/

   BMSfreeBlockMemoryArrayNull((*sdpisolver)->blkmem, &(*sdpisolver)->inputtosdpamapper, (*sdpisolver)->nvars);/*lint !e737*/

   BMSfreeBlockMemoryArrayNull((*sdpisolver)->blkmem, &(*sdpisolver)->sdpatoinputmapper, (*sdpisolver)->nactivevars);/*lint !e737*/

   BMSfreeBlockMemoryArrayNull((*sdpisolver)->blkmem, &(*sdpisolver)->fixedvarsval, (*sdpisolver)->nvars - (*sdpisolver)->nactivevars); /*lint !e776*/

   BMSfreeBlockMemory((*sdpisolver)->blkmem, sdpisolver);

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverIncreaseCounter(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );

   sdpisolver->sdpcounter++;

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverResetCounter(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );

   SCIPdebugMessage("Resetting counter of SDP-Interface from %d to 0.\n", sdpisolver->sdpcounter);
   sdpisolver->sdpcounter = 0;

   return SCIP_OKAY;
}

/*
 * Solving Methods
 */

SCIP_RETCODE SCIPsdpiSolverLoadAndSolve(
   SCIP_SDPISOLVER*      sdpisolver,         
   int                   nvars,              
   SCIP_Real*            obj,                
   SCIP_Real*            lb,                 
   SCIP_Real*            ub,                 
   int                   nsdpblocks,         
   int*                  sdpblocksizes,      
   int*                  sdpnblockvars,      
   int                   sdpconstnnonz,      
   int*                  sdpconstnblocknonz, 
   int**                 sdpconstrow,        
   int**                 sdpconstcol,        
   SCIP_Real**           sdpconstval,        
   int                   sdpnnonz,           
   int**                 sdpnblockvarnonz,   
   int**                 sdpvar,             
   int***                sdprow,             
   int***                sdpcol,             
   SCIP_Real***          sdpval,             
   int**                 indchanges,         
   int*                  nremovedinds,       
   int*                  blockindchanges,    
   int                   nremovedblocks,     
   int                   nlpcons,            
   int                   noldlpcons,         
   SCIP_Real*            lplhs,              
   SCIP_Real*            lprhs,              
   int*                  lprownactivevars,   
   int                   lpnnonz,            
   int*                  lprow,              
   int*                  lpcol,              
   SCIP_Real*            lpval,              
   SCIP_Real*            start,              
   SCIP_SDPSOLVERSETTING startsettings,      
   SCIP_Real             timelimit           
   )
{/*lint !e1784*/
   return SCIPsdpiSolverLoadAndSolveWithPenalty(sdpisolver, 0.0, TRUE, FALSE, nvars, obj, lb, ub, nsdpblocks, sdpblocksizes, sdpnblockvars, sdpconstnnonz,
               sdpconstnblocknonz, sdpconstrow, sdpconstcol, sdpconstval, sdpnnonz, sdpnblockvarnonz, sdpvar, sdprow, sdpcol, sdpval, indchanges,
               nremovedinds, blockindchanges, nremovedblocks, nlpcons, noldlpcons, lplhs, lprhs, lprownactivevars, lpnnonz, lprow, lpcol, lpval, start,
               startsettings, timelimit, NULL, NULL);
}

SCIP_RETCODE SCIPsdpiSolverLoadAndSolveWithPenalty(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real             penaltyparam,       
   SCIP_Bool             withobj,            
   SCIP_Bool             rbound,             
   int                   nvars,              
   SCIP_Real*            obj,                
   SCIP_Real*            lb,                 
   SCIP_Real*            ub,                 
   int                   nsdpblocks,         
   int*                  sdpblocksizes,      
   int*                  sdpnblockvars,      
   int                   sdpconstnnonz,      
   int*                  sdpconstnblocknonz, 
   int**                 sdpconstrow,        
   int**                 sdpconstcol,        
   SCIP_Real**           sdpconstval,        
   int                   sdpnnonz,           
   int**                 sdpnblockvarnonz,   
   int**                 sdpvar,             
   int***                sdprow,             
   int***                sdpcol,             
   SCIP_Real***          sdpval,             
   int**                 indchanges,         
   int*                  nremovedinds,       
   int*                  blockindchanges,    
   int                   nremovedblocks,     
   int                   nlpcons,            
   int                   noldlpcons,         
   SCIP_Real*            lplhs,              
   SCIP_Real*            lprhs,              
   int*                  rownactivevars,     
   int                   lpnnonz,            
   int*                  lprow,              
   int*                  lpcol,              
   SCIP_Real*            lpval,              
   SCIP_Real*            start,              
   SCIP_SDPSOLVERSETTING startsettings,      
   SCIP_Real             timelimit,          
   SCIP_Bool*            feasorig,           
   SCIP_Bool*            penaltybound        
   )
{/*lint !e1784*/
   SCIP_Real feastol;
   SCIP_Real* sdpavarbounds;
   int i;
   int k;
   int block;
   int nfixedvars;
   bool checkinput; /* should the input be checked for consistency in SDPA ? */
   int lpconsind;
   int lastrow;
   int* rowmapper; /* maps the lhs- and rhs-inequalities of the old LP-cons to their constraint numbers in DSDP */
   int nlpineqs;
   int pos;
   int newpos;
   int oldnactivevars;
#ifdef SCIP_MORE_DEBUG
   int ind;
#endif

#ifdef SCIP_DEBUG
   char phase_string[15];
#endif

   assert( sdpisolver != NULL );
   assert( penaltyparam > -1 * sdpisolver->epsilon );
   assert( penaltyparam < sdpisolver->epsilon || ( feasorig != NULL ) );
   assert( nvars > 0 );
   assert( obj != NULL );
   assert( lb != NULL );
   assert( ub != NULL );
   assert( nsdpblocks >= 0 );
   assert( nsdpblocks == 0 || sdpblocksizes != NULL );
   assert( nsdpblocks == 0 || sdpnblockvars != NULL );
   assert( sdpconstnnonz >= 0 );
   assert( nsdpblocks == 0 || sdpconstnnonz == 0 || sdpconstnblocknonz != NULL );
   assert( nsdpblocks == 0 || sdpconstnnonz == 0 || sdpconstrow != NULL );
   assert( nsdpblocks == 0 || sdpconstnnonz == 0 || sdpconstcol != NULL );
   assert( nsdpblocks == 0 || sdpconstnnonz == 0 || sdpconstval != NULL );
   assert( sdpnnonz >= 0 );
   assert( nsdpblocks == 0 || sdpnblockvarnonz != NULL );
   assert( nsdpblocks == 0 || sdpvar != NULL );
   assert( nsdpblocks == 0 || sdprow != NULL );
   assert( nsdpblocks == 0 || sdpcol != NULL );
   assert( nsdpblocks == 0 || sdpval != NULL );
   assert( nsdpblocks == 0 || indchanges != NULL );
   assert( nsdpblocks == 0 || nremovedinds != NULL );
   assert( nsdpblocks == 0 || blockindchanges != NULL );
   assert( 0 <= nremovedblocks && nremovedblocks <= nsdpblocks );
   assert( nlpcons >= 0 );
   assert( noldlpcons >= nlpcons );
   assert( nlpcons == 0 || lplhs != NULL );
   assert( nlpcons == 0 || lprhs != NULL );
   assert( nlpcons == 0 || rownactivevars != NULL );
   assert( lpnnonz >= 0 );
   assert( nlpcons == 0 || lprow != NULL );
   assert( nlpcons == 0 || lpcol != NULL );
   assert( nlpcons == 0 || lpval != NULL );

   sdpisolver->niterations = 0;
   sdpisolver->nsdpcalls = 0;

   /* immediately exit if the time limit is negative */
   if ( timelimit <= 0.0 )
   {
      sdpisolver->solved = FALSE;
      sdpisolver->timelimit = TRUE;
      return SCIP_OKAY;
   }
   else
      sdpisolver->timelimit = FALSE;

#ifndef SCIP_NDEBUG
   checkinput = false;
#else
   checkinput = true;
#endif

   sdpisolver->usedsetting = SCIP_SDPSOLVERSETTING_UNSOLVED;

   /* only increase the counter if we don't use the penalty formulation to stay in line with the numbers in the general interface (where this is still the
    * same SDP) */
   if ( penaltyparam < sdpisolver->epsilon )
      SCIPdebugMessage("Inserting Data into SDPA for SDP (%d) \n", ++sdpisolver->sdpcounter);
   else
      SCIPdebugMessage("Inserting Data again into SDPA for SDP (%d) \n", sdpisolver->sdpcounter);

   /* set the penalty and rbound flags accordingly */
   sdpisolver->penalty = (penaltyparam < sdpisolver->epsilon) ? FALSE : TRUE;
   sdpisolver->rbound = rbound;

   /* allocate memory for inputtosdpamapper, sdpatoinputmapper and the fixed variable information, for the latter this will
    * later be shrinked if the needed size is known */
   BMS_CALL( BMSreallocBlockMemoryArray(sdpisolver->blkmem, &(sdpisolver->inputtosdpamapper), sdpisolver->nvars, nvars) );
   BMS_CALL( BMSreallocBlockMemoryArray(sdpisolver->blkmem, &(sdpisolver->sdpatoinputmapper), sdpisolver->nactivevars, nvars) );
   BMS_CALL( BMSreallocBlockMemoryArray(sdpisolver->blkmem, &(sdpisolver->fixedvarsval), sdpisolver->nvars - sdpisolver->nactivevars, nvars) ); /*lint !e776*/

   oldnactivevars = sdpisolver->nactivevars; /* we need to save this to realloc the varboundpos-array if needed */
   sdpisolver->nvars = nvars;
   sdpisolver->nactivevars = 0;
   nfixedvars = 0;

   /* find the fixed variables */
   sdpisolver->fixedvarsobjcontr = 0.0;
   for (i = 0; i < nvars; i++)
   {
      if ( isFixed(sdpisolver, lb[i], ub[i]) )
      {
         sdpisolver->fixedvarsobjcontr += obj[i] * lb[i]; /* this is the value this fixed variable contributes to the objective */
         sdpisolver->fixedvarsval[nfixedvars] = lb[i]; /* if lb=ub, than this is the value the variable will have in every solution */
         nfixedvars++;
         sdpisolver->inputtosdpamapper[i] = -nfixedvars;
         SCIPdebugMessage("Fixing variable %d locally to %f for SDP %d in SDPA\n", i, lb[i], sdpisolver->sdpcounter);
      }
      else
      {
         sdpisolver->sdpatoinputmapper[sdpisolver->nactivevars] = i;
         sdpisolver->nactivevars++;
         sdpisolver->inputtosdpamapper[i] = sdpisolver->nactivevars; /* sdpa starts counting at 1, so we do this after increasing nactivevars */
#ifdef SCIP_MORE_DEBUG
         SCIPdebugMessage("Variable %d becomes variable %d for SDP %d in SDPA\n", i, sdpisolver->inputtosdpamapper[i], sdpisolver->sdpcounter);
#endif
      }
   }
   assert( sdpisolver->nactivevars + nfixedvars == sdpisolver->nvars );

   /* if we want to solve without objective, we reset fixedvarsobjcontr */
   if ( ! withobj )
      sdpisolver->fixedvarsobjcontr = 0.0;

   /* shrink the fixedvars and sdpatoinputmapper arrays to the right size */
   BMS_CALL( BMSreallocBlockMemoryArray(sdpisolver->blkmem, &(sdpisolver->fixedvarsval), nvars, nfixedvars) );
   BMS_CALL( BMSreallocBlockMemoryArray(sdpisolver->blkmem, &(sdpisolver->sdpatoinputmapper), nvars, sdpisolver->nactivevars) );

   /* insert data */
   if ( sdpisolver->sdpa != 0 )
   {
      /* if the SDPA solver has already been created, clear the current problem instance */
      delete sdpisolver->sdpa;
      sdpisolver->sdpa = new SDPA();
   }
   else
      sdpisolver->sdpa = new SDPA();
   assert( sdpisolver->sdpa != 0 );

   /* initialize settings (this needs to be done before inserting the problem as the initial point depends on the settings) */
   if ( penaltyparam >= sdpisolver->epsilon || startsettings == SCIP_SDPSOLVERSETTING_STABLE || startsettings == SCIP_SDPSOLVERSETTING_PENALTY )
   {
      sdpisolver->sdpa->setParameterType(SDPA::PARAMETER_STABLE_BUT_SLOW); /* if we already had problems with this problem, there is no reason to try fast */
      /* as we want to solve with stable settings, we also update epsilon and the feasibility tolerance, as we skip the default settings, we multpy twice */
      sdpisolver->sdpa->setParameterEpsilonStar(GAPTOLCHANGE * GAPTOLCHANGE * sdpisolver->gaptol);
      sdpisolver->sdpa->setParameterEpsilonDash(FEASTOLCHANGE * FEASTOLCHANGE * sdpisolver->sdpsolverfeastol);
      feastol = FEASTOLCHANGE * FEASTOLCHANGE * sdpisolver->sdpsolverfeastol;
      SCIPdebugMessage("Start solving process with stable settings\n");
   }
   else if ( startsettings == SCIP_SDPSOLVERSETTING_UNSOLVED || startsettings == SCIP_SDPSOLVERSETTING_FAST)
   {
      sdpisolver->sdpa->setParameterType(SDPA::PARAMETER_UNSTABLE_BUT_FAST);
      sdpisolver->sdpa->setParameterEpsilonStar(sdpisolver->gaptol);
      sdpisolver->sdpa->setParameterEpsilonDash(sdpisolver->sdpsolverfeastol);
      feastol = sdpisolver->sdpsolverfeastol;
      SCIPdebugMessage("Start solving process with fast settings\n");
   }
   else if ( startsettings == SCIP_SDPSOLVERSETTING_MEDIUM )
   {
      sdpisolver->sdpa->setParameterType(SDPA::PARAMETER_DEFAULT);
      /* as we want to solve with stable settings, we also update epsilon and the feasibility tolerance, as we skip the default settings, we multpy once */
      sdpisolver->sdpa->setParameterEpsilonStar(GAPTOLCHANGE * sdpisolver->gaptol);
      sdpisolver->sdpa->setParameterEpsilonDash(FEASTOLCHANGE * sdpisolver->sdpsolverfeastol);
      feastol = FEASTOLCHANGE * sdpisolver->sdpsolverfeastol;
      SCIPdebugMessage("Start solving process with medium settings\n");
   }
   else
   {
      SCIPdebugMessage("Unknown setting for start-settings: %d!\n", startsettings);  \
      return SCIP_LPERROR;
   }
   sdpisolver->sdpa->setParameterLowerBound(-1e20);


   /* set the objective limit */
   if ( ! SCIPsdpiSolverIsInfinity(sdpisolver, sdpisolver->objlimit) )
      sdpisolver->sdpa->setParameterUpperBound(sdpisolver->objlimit);
   else
      sdpisolver->sdpa->setParameterUpperBound(1e8);

   /* increase Lambda Star, this seems to help the numerics */
   sdpisolver->sdpa->setParameterLambdaStar(sdpisolver->lambdastar);

#ifdef SCIP_MORE_DEBUG
   sdpisolver->sdpa->printParameters(stdout);
#endif

   /* compute number of variable bounds and save them in sdpavarbounds */
   sdpisolver->nvarbounds = 0;
   BMS_CALL( BMSallocBufferMemoryArray(sdpisolver->bufmem, &sdpavarbounds, 2 * sdpisolver->nactivevars) ); /*lint !e647*//*lint !e530*/

   if ( sdpisolver->nactivevars != oldnactivevars )
   {
      if ( sdpisolver->varboundpos == NULL )
      {
         BMS_CALL( BMSallocBlockMemoryArray(sdpisolver->blkmem, &(sdpisolver->varboundpos), 2 * sdpisolver->nactivevars) ); /*lint !e647*/
      }
      else
      {
         BMS_CALL( BMSreallocBlockMemoryArray(sdpisolver->blkmem, &(sdpisolver->varboundpos), 2 * oldnactivevars, 2 * sdpisolver->nactivevars) ); /*lint !e647*/
      }
   }
   assert( sdpisolver->varboundpos != NULL );

   for (i = 0; i < sdpisolver->nactivevars; i++)
   {
      assert( 0 <= sdpisolver->sdpatoinputmapper[i] && sdpisolver->sdpatoinputmapper[i] < nvars );
      if ( ! SCIPsdpiSolverIsInfinity(sdpisolver, lb[sdpisolver->sdpatoinputmapper[i]]))
      {
         sdpavarbounds[sdpisolver->nvarbounds] = lb[sdpisolver->sdpatoinputmapper[i]];
         sdpisolver->varboundpos[sdpisolver->nvarbounds] = -(i + 1); /* negative sign means lower bound, i + 1 because sdpa starts counting from one */
         (sdpisolver->nvarbounds)++;
      }
      if ( ! SCIPsdpiSolverIsInfinity(sdpisolver, ub[sdpisolver->sdpatoinputmapper[i]]) )
      {
         sdpavarbounds[sdpisolver->nvarbounds] = ub[sdpisolver->sdpatoinputmapper[i]];
         sdpisolver->varboundpos[sdpisolver->nvarbounds] = +(i + 1); /* positive sign means upper bound, i + 1 because sdpa starts counting from one */
         (sdpisolver->nvarbounds)++;
      }
   }

   if ( nlpcons > 0 )
   {
      /* allocate memory to save which lpconstraints are mapped to which index, entry 2i corresponds to the left hand side of row i, 2i+1 to the rhs */
      BMS_CALL( BMSallocBufferMemoryArray(sdpisolver->bufmem, &rowmapper, 2*noldlpcons) ); /*lint !e647*//*lint !e530*/

      /* compute the number of LP constraints after splitting the ranged rows and compute the rowmapper */
      pos = 1; /* SDPA starts counting the LP-inequalities at one */
      newpos = 0; /* the position in the lhs and rhs arrays */
      for (i = 0; i < noldlpcons; i++)
      {
         if ( rownactivevars[i] >= 2 )
         {
            if ( lplhs[newpos] > - SCIPsdpiSolverInfinity(sdpisolver) )
            {
               rowmapper[2*i] = pos; /*lint !e679*/
               pos++;
            }
            else
               rowmapper[2*i] = -1; /*lint !e679*/
            if ( lprhs[newpos] < SCIPsdpiSolverInfinity(sdpisolver) )
            {
               rowmapper[2*i + 1] = pos; /*lint !e679*/
               pos++;
            }
            else
               rowmapper[2*i + 1] = -1; /*lint !e679*/

            newpos++;
         }
         else
         {
            rowmapper[2*i] = -1; /*lint !e679*/
            rowmapper[2*i + 1] = -1; /*lint !e679*/
         }
      }
      nlpineqs = pos - 1; /* minus one because we started at one as SDPA wants them numbered one to nlpineqs */
      assert( nlpineqs <= 2*nlpcons ); /* *2 comes from left- and right-hand-sides */
   }
   else
      nlpineqs = 0;

   /* if we use a penalty formulation, we need the constraint r >= 0 */
   if ( penaltyparam >= sdpisolver->epsilon && rbound )
      sdpisolver->nvarbounds++;

   if ( sdpisolver->sdpinfo )
      sdpisolver->sdpa->setDisplay(stdout);
   else
      sdpisolver->sdpa->setDisplay(0);

#ifdef SCIP_MORE_DEBUG
   FILE* fpOut = fopen("output.tmp", "w");
   if ( ! fpOut )
      exit(-1);
   sdpisolver->sdpa->setResultFile(fpOut);
#endif

   /* initialize blockstruct */
   if ( penaltyparam < sdpisolver->epsilon ) /* we initialize this with an exact 0.0 in Solve without penalty */
      sdpisolver->sdpa->inputConstraintNumber((long long) sdpisolver->nactivevars);/*lint !e747*/
   else
      sdpisolver->sdpa->inputConstraintNumber((long long) sdpisolver->nactivevars + 1);/*lint !e747*/ /* the additional variable is r for the penalty formulation */

   /* if there are any lp-cons/variable-bounds, we get an extra block for those, lastrow - nshifts is the number of lp constraints added */
   sdpisolver->sdpa->inputBlockNumber((long long) ((nlpineqs + sdpisolver->nvarbounds > 0) ?
         nsdpblocks - nremovedblocks + 1 : nsdpblocks - nremovedblocks)); /*lint !e834 !e747 !e776*/

   /* block+1 because SDPA starts counting at 1 */
   for (block = 0; block < nsdpblocks; block++)
   {
      if ( blockindchanges[block] >= 0 )
      {
         SCIPdebugMessage("adding block %d to SDPA as block %d with size %d\n",
               block, block - blockindchanges[block] + 1, sdpblocksizes[block] - nremovedinds[block]); /*lint !e834*/
         sdpisolver->sdpa->inputBlockSize((long long) block - blockindchanges[block] + 1,/*lint !e747, !e834*/
               (long long) sdpblocksizes[block] - nremovedinds[block]); /*lint !e834, !e776, !e747*/
         sdpisolver->sdpa->inputBlockType((long long) block - blockindchanges[block] + 1, SDPA::SDP); /*lint !e834, !e776, !e747*/
      }
   }
   if ( nlpineqs + sdpisolver->nvarbounds > 0 )
   {
      /* the last block is the lp block, the size has a negative sign */
      sdpisolver->sdpa->inputBlockSize((long long) nsdpblocks - nremovedblocks + 1, (long long) -(nlpineqs + sdpisolver->nvarbounds)); /*lint !e834, !e776, !e747*/
      sdpisolver->sdpa->inputBlockType((long long) nsdpblocks - nremovedblocks + 1, SDPA::LP); /*lint !e834, !e776, !e747*/
      SCIPdebugMessage("adding LP block to SDPA as block %d with size %d\n", nsdpblocks - nremovedblocks + 1,/*lint !e834*/
            -(nlpineqs + sdpisolver->nvarbounds)); /*lint !e834*/
   }

   sdpisolver->sdpa->initializeUpperTriangleSpace();

   /* set objective values */
   for (i = 0; i < sdpisolver->nactivevars; i++)
   {
      if ( withobj )
      {
         /* insert objective value, SDPA counts from 1 to n instead of 0 to n-1 */
         sdpisolver->sdpa->inputCVec((long long) i + 1, obj[sdpisolver->sdpatoinputmapper[i]]);/*lint !e747*/
#ifdef SCIP_MORE_DEBUG
         SCIPdebugMessage("inserting objective %f for variable %d which became variable %d in SDPA\n", obj[sdpisolver->sdpatoinputmapper[i]],
               sdpisolver->sdpatoinputmapper[i], i+1);
#endif
      }
      if ( penaltyparam >= sdpisolver->epsilon )
         sdpisolver->sdpa->inputCVec((long long) sdpisolver->nactivevars + 1, penaltyparam);/*lint !e747*/ /* set the objective of the additional var to penaltyparam */
   }

   /* if we want to use a starting point we have to tell SDPA to allocate memory for it */
   if ( start != NULL )
      sdpisolver->sdpa->setInitPoint(true);
   else
      sdpisolver->sdpa->setInitPoint(false);

   /* start inserting the non-constant SDP-Constraint-Matrices */
   if ( sdpnnonz > 0 )
   {
      int v;
      int blockvar;

      assert( nsdpblocks > 0 );
      assert( sdpnblockvarnonz != NULL );
      assert( sdpnblockvars != NULL );
      assert( sdpcol != NULL );
      assert( sdprow != NULL );
      assert( sdpval != NULL );
      assert( sdpvar != NULL );
      assert( indchanges != NULL );
      assert( nremovedinds != NULL );

      for (block = 0; block < nsdpblocks; block++)
      {
         /* if the block has no entries, we skip it */
         if ( blockindchanges[block] == -1 )
            continue;
#ifdef SCIP_MORE_DEBUG
         SCIPdebugMessage("   -> building block %d, which becomes block %d in SDPA (%d)\n", block, block - blockindchanges[block] + 1,sdpisolver->sdpcounter);
#endif
         /* iterate over all variables in this block */
         for (blockvar = 0; blockvar < sdpnblockvars[block]; blockvar++)
         {
            v = sdpisolver->inputtosdpamapper[sdpvar[block][blockvar]];

#ifdef SCIP_MORE_DEBUG
            SCIPdebugMessage("      -> adding coefficient matrix for variable %d which becomes variable %d in SDPA (%d)\n",
               sdpvar[block][blockvar], v, sdpisolver->sdpcounter);
#endif

            /* check if the variable is active */
            if ( v > -1 )
            {
               for (k = 0; k < sdpnblockvarnonz[block][blockvar]; k++)
               {
                  /* rows and cols with active nonzeros should not be removed */
                  assert( indchanges[block][sdprow[block][blockvar][k]] > -1 && indchanges[block][sdpcol[block][blockvar][k]] > -1 );

                  assert( indchanges[block][sdprow[block][blockvar][k]] <= sdprow[block][blockvar][k]);
                  assert( indchanges[block][sdpcol[block][blockvar][k]] <= sdpcol[block][blockvar][k]);

                  assert( 0 <= sdprow[block][blockvar][k] && sdprow[block][blockvar][k] < sdpblocksizes[block] );
                  assert( 0 <= sdpcol[block][blockvar][k] && sdpcol[block][blockvar][k] < sdpblocksizes[block] );

                  /* rows and columns start with one in SDPA, so we have to add 1 to the indices */
#ifdef SCIP_MORE_DEBUG
                  SCIPdebugMessage("         -> adding nonzero %g at (%d,%d) (%d)\n",
                        sdpval[block][blockvar][k],
                        sdpcol[block][blockvar][k] - indchanges[block][sdpcol[block][blockvar][k]] + 1,
                        sdprow[block][blockvar][k] - indchanges[block][sdprow[block][blockvar][k]] + 1,
                        sdpisolver->sdpcounter);
#endif

                  sdpisolver->sdpa->inputElement((long long) v, (long long) block - blockindchanges[block] + 1, /*lint !e834, !e747*/
                        (long long) sdpcol[block][blockvar][k] - indchanges[block][sdpcol[block][blockvar][k]] + 1, /*lint !e834, !e747*/
                        (long long) sdprow[block][blockvar][k] - indchanges[block][sdprow[block][blockvar][k]] + 1, /*lint !e834, !e747*/
                        sdpval[block][blockvar][k], checkinput); /*lint !e776 !e834*/
               }
            }
         }
         /* insert the identity matrix if we are using a penalty formulation */
         if ( penaltyparam >= sdpisolver->epsilon )
         {
#ifdef SCIP_MORE_DEBUG
            SCIPdebugMessage("      -> adding coefficient matrix for penalty variable r in SDPA (%d)\n", sdpisolver->sdpcounter);
#endif
            for (i = 0; i < sdpblocksizes[block] - nremovedinds[block]; i++)
            {
#ifdef SCIP_MORE_DEBUG
                  SCIPdebugMessage("         -> adding nonzero 1.0 at (%d,%d) (%d)\n", i + 1, i + 1, sdpisolver->sdpcounter);
#endif

                  sdpisolver->sdpa->inputElement((long long) sdpisolver->nactivevars + 1, (long long) block - blockindchanges[block] + 1, /*lint !e747, !e776, !e834*/
                        (long long) i + 1, (long long) i + 1, 1.0, checkinput);/*lint !e747*/
            }
         }
      }
   }

   /* start inserting the constant matrix */
   if ( sdpconstnnonz > 0 )
   {
      assert( nsdpblocks > 0 );
      assert( sdpconstnblocknonz!= NULL );
      assert( sdpconstcol != NULL );
      assert( sdpconstrow != NULL );
      assert( sdpconstval != NULL );

      for (block = 0; block < nsdpblocks; block++)
      {
         if ( blockindchanges[block] == -1 )
            continue;
#ifdef SCIP_MORE_DEBUG
         SCIPdebugMessage("   -> building block %d (%d)\n", block + 1, sdpisolver->sdpcounter);
#endif
         for (k = 0; k < sdpconstnblocknonz[block]; k++)
         {
            /* rows and cols with active nonzeros should not be removed */
            assert( indchanges[block][sdpconstrow[block][k]] > -1 && indchanges[block][sdpconstcol[block][k]] > -1 );

            assert( indchanges[block][sdpconstrow[block][k]] <= sdpconstrow[block][k]);
            assert( indchanges[block][sdpconstcol[block][k]] <= sdpconstcol[block][k]);

            assert (0 <= sdpconstrow[block][k] && sdpconstrow[block][k] < sdpblocksizes[block]);
            assert (0 <= sdpconstcol[block][k] && sdpconstcol[block][k] < sdpblocksizes[block]);

            /* rows and columns start with one in SDPA, so we have to add 1 to the indices, the constant matrix is given as variable 0 */
#ifdef SCIP_MORE_DEBUG
            SCIPdebugMessage("         -> adding constant nonzero %g at (%d,%d) (%d)\n", sdpconstval[block][k],
               sdpconstcol[block][k] - indchanges[block][sdpconstcol[block][k]] + 1,
               sdpconstrow[block][k] - indchanges[block][sdpconstrow[block][k]] + 1,
               sdpisolver->sdpcounter);
#endif
            sdpisolver->sdpa->inputElement((long long) 0, (long long) block - blockindchanges[block] + 1, /*lint !e747, !e776, !e834*/
               (long long) sdpconstcol[block][k] - indchanges[block][sdpconstcol[block][k]] + 1, /*lint !e747, !e776, !e834*/
               (long long) sdpconstrow[block][k] - indchanges[block][sdpconstrow[block][k]] + 1, /*lint !e747, !e776, !e834*/
               sdpconstval[block][k], checkinput);
         }
      }
   }

#ifdef SCIP_MORE_DEBUG
         SCIPdebugMessage("   -> building LP-block %d (%d)\n", nsdpblocks - nremovedblocks + 1, sdpisolver->sdpcounter);
#endif
   /* inserting LP nonzeros */
   lastrow = -1;
   for (i = 0; i < lpnnonz; i++)
   {
      assert( 0 <= lprow[i] && lprow[i] < noldlpcons );
      assert( 0 <= lpcol[i] && lpcol[i] < nvars );
      assert( REALABS(lpval[i]) > sdpisolver->epsilon );

      /* if the variable is active and the constraint is more than a bound, we add it */
      if ( sdpisolver->inputtosdpamapper[lpcol[i]] > 0 )
      {
       /* as this is an active variable, there should be at least one in the constraint */
         assert( rownactivevars[lprow[i]] > 0 );
         if ( rownactivevars[lprow[i]] > 1 )
         {
            if ( lprow[i] > lastrow )  /* we update the lpcons-counter */
            {
               lastrow = lprow[i];
               /* if we use a penalty formulation, add the r * Identity entry */
               if ( penaltyparam >= sdpisolver->epsilon )
               {
                  /* check for the lhs-inequality */
                  if ( rowmapper[2*lastrow] > -1 ) /*lint !e679*/
                  {
#ifdef SCIP_MORE_DEBUG
                     SCIPdebugMessage("         -> adding nonzero 1.0 at (%d,%d) for penalty variable r in SDPA (%d)\n",
                        rowmapper[2*lastrow], rowmapper[2*lastrow], sdpisolver->sdpcounter);
#endif
                     /* LP nonzeros are added as diagonal entries of the last block (coming after the last SDP-block, with
                      * blocks starting at 1, as are rows), the r-variable is variable nactivevars + 1 */
                     sdpisolver->sdpa->inputElement((long long) sdpisolver->nactivevars + 1, (long long) nsdpblocks - nremovedblocks + 1, /*lint !e747, !e776, !e834*/
                           (long long) rowmapper[2*lastrow], (long long) rowmapper[2*lastrow], 1.0, checkinput); /*lint !e679, !e747, !e834*/
                  }

                  /* check for the rhs-inequality */
                  if ( rowmapper[2*lastrow + 1] > -1 ) /*lint !e679*/
                  {
#ifdef SCIP_MORE_DEBUG
                     SCIPdebugMessage("         -> adding nonzero 1.0 at (%d,%d) for penalty variable r in SDPA (%d)\n",
                        rowmapper[2*lastrow + 1], rowmapper[2*lastrow + 1], sdpisolver->sdpcounter);
#endif
                     /* LP nonzeros are added as diagonal entries of the last block (coming after the last SDP-block, with
                      * blocks starting at 1, as are rows), the r-variable is variable nactivevars + 1 */
                     sdpisolver->sdpa->inputElement((long long) sdpisolver->nactivevars + 1, (long long) nsdpblocks - nremovedblocks + 1, /*lint !e747, !e776, !e834*/
                           (long long) rowmapper[2*lastrow + 1], (long long) rowmapper[2*lastrow + 1], 1.0, checkinput); /*lint !e679, !e747, !e834*/
                  }
               }
            }
            /* add the lp-nonzero to the lhs-inequality if it exists: */
            if ( rowmapper[2*lastrow] > -1 ) /*lint !e679*/
            {
#ifdef SCIP_MORE_DEBUG
               SCIPdebugMessage("         -> adding nonzero %g at (%d,%d) for variable %d which became variable %d in SDPA (%d)\n",
                  lpval[i], rowmapper[2*lastrow], rowmapper[2*lastrow], lpcol[i], sdpisolver->inputtosdpamapper[lpcol[i]], sdpisolver->sdpcounter);
#endif
               /* LP nonzeros are added as diagonal entries of the last block (coming after the last SDP-block, with blocks starting at 1, as are rows) */
               sdpisolver->sdpa->inputElement((long long) sdpisolver->inputtosdpamapper[lpcol[i]], (long long) nsdpblocks - nremovedblocks + 1, /*lint !e747, !e776, !e834*/
                     (long long) rowmapper[2*lastrow], (long long) rowmapper[2*lastrow], lpval[i], checkinput); /*lint !e679, !e747, !e834*/
            }
            /* add the lp-nonzero to the rhs-inequality if it exists: */
            if ( rowmapper[2*lastrow + 1] > -1 ) /*lint !e679*/
            {
#ifdef SCIP_MORE_DEBUG
               SCIPdebugMessage("         -> adding nonzero %g at (%d,%d) for variable %d which became variable %d in SDPA (%d)\n",
                  -1 * lpval[i], rowmapper[2*lastrow + 1], rowmapper[2*lastrow + 1], lpcol[i], sdpisolver->inputtosdpamapper[lpcol[i]], sdpisolver->sdpcounter);
#endif
               /* LP nonzeros are added as diagonal entries of the last block (coming after the last SDP-block, with blocks starting at 1, as are rows),
                * the -1 comes from the fact that this is a <=-constraint, while SDPA works with >= */
               sdpisolver->sdpa->inputElement((long long) sdpisolver->inputtosdpamapper[lpcol[i]], (long long) nsdpblocks - nremovedblocks + 1, /*lint !e747, !e776, !e834*/
                     (long long) rowmapper[2*lastrow + 1], (long long) rowmapper[2*lastrow + 1], -1 * lpval[i], checkinput); /*lint !e679, !e747, !e834*/
            }
         }
      }
   }

   /* inserting LP left- and right-hand-sides for active constraints */
   lpconsind = 1; /* this is the same order we used when computing the rowmapper, so we insert at the right positions */
   for (i = 0; i < nlpcons; i++)
   {
      /* check for left-hand side */
      if ( lplhs[i] > - SCIPsdpiSolverInfinity(sdpisolver) )
      {
#ifdef SCIP_MORE_DEBUG
         SCIPdebugMessage("         -> adding lhs %g at (%d,%d) (%d)\n", lplhs[i], lpconsind, lpconsind, sdpisolver->sdpcounter);
#endif
         /* LP constraints are added as diagonal entries of the last block, left-hand-side is added as variable zero */
         sdpisolver->sdpa->inputElement((long long) 0, (long long) nsdpblocks - nremovedblocks + 1, (long long) lpconsind, /*lint !e747, !e776, !e834*/
               (long long) lpconsind, lplhs[i], checkinput);/*lint !e747*/
         lpconsind++;
      }

      /* check for right-hand side */
      if ( lprhs[i] < SCIPsdpiSolverInfinity(sdpisolver) )
      {
#ifdef SCIP_MORE_DEBUG
         SCIPdebugMessage("         -> adding lhs (originally rhs) %g at (%d,%d) (%d)\n", -1 * lprhs[i], lpconsind, lpconsind, sdpisolver->sdpcounter);
#endif
         /* LP constraints are added as diagonal entries of the last block, right-hand side is added as variable zero, the -1 comes from
          * the fact, that SDPA uses >=, while the rhs is a <=-constraint */
         sdpisolver->sdpa->inputElement((long long) 0, (long long) nsdpblocks - nremovedblocks + 1, (long long) lpconsind, /*lint !e747, !e776, !e834*/
               (long long) lpconsind, -1 * lprhs[i], checkinput);/*lint !e747*/
         lpconsind++;
      }
   }

   assert( lpconsind == nlpineqs + 1 ); /* plus one because we started at one as SDPA wants them numbered one to nlpineqs */

   /* print each LP-constraint as one formatted constraint in addition to the single entries inserted into SDPA */
#ifdef SCIP_MORE_DEBUG
   lastrow = -1;
   ind = -1; /* this is increased once before the first usage */
   for (i = 0; i < lpnnonz; i++)
   {
      /* if the variable is active and the constraint is more than a bound, we added it */
      if ( sdpisolver->inputtosdpamapper[lpcol[i]] > 0 )
      {
         if ( rownactivevars[lprow[i]] > 1 )
         {
            if ( lprow[i] > lastrow )  /* we finished the old row */
            {
               if ( lastrow >= 0 )
               {
                  if ( lprhs[ind] < SCIPsdpiSolverInfinity(sdpisolver) )
                     SCIPmessagePrintInfo(sdpisolver->messagehdlr, " <= %f\n", lprhs[ind]);
                  else
                     SCIPmessagePrintInfo(sdpisolver->messagehdlr, "\n");
               }
               lastrow = lprow[i];
               ind++;
               if ( lplhs[ind] > - SCIPsdpiSolverInfinity(sdpisolver) )
                  SCIPmessagePrintInfo(sdpisolver->messagehdlr, "%f <= ", lplhs[ind]);
            }
            SCIPmessagePrintInfo(sdpisolver->messagehdlr, "+ %f <x%d> ", lpval[i], lpcol[i]);
         }
      }
   }
   if ( lastrow >= 0 )
   {
      if ( lprhs[ind] < SCIPsdpiSolverInfinity(sdpisolver) )
         SCIPmessagePrintInfo(sdpisolver->messagehdlr, " <= %f\n", lprhs[ind]);
      else
         SCIPmessagePrintInfo(sdpisolver->messagehdlr, "\n");
   }
   assert( ind == nlpcons - 1 ); /* -1 because we start indexing at zero and do not increase after the last row */
#endif

   /* free the memory for the rowmapper */
   if ( nlpcons > 0 )
      BMSfreeBufferMemoryArray(sdpisolver->bufmem, &rowmapper);/*lint !e647, !e737*/

   /* insert variable bounds, these are also added as LP-constraints and therefore diagonal entries of the LP block
    * if we work with the penalty formulation, we get an extra entry for r >= 0, but this we will add afterwards */
   for (i = 0; i < ((penaltyparam < sdpisolver->epsilon) || (! rbound) ? sdpisolver->nvarbounds : sdpisolver->nvarbounds - 1); i++)
   {
      assert( 0 < abs(sdpisolver->varboundpos[i]) && abs(sdpisolver->varboundpos[i] <= sdpisolver->nactivevars) ); /* the indices are already those for SDPA */

      /* for lower bound */
      if ( sdpisolver->varboundpos[i] < 0 )
      {
         /* add it as an lp-constraint for this variable (- because we saved -n for the lower bound), at the position
          * (nactivelpcons + 1) + varbound-index, because we have >= the variable has coefficient +1 */
         sdpisolver->sdpa->inputElement((long long) -sdpisolver->varboundpos[i], (long long) nsdpblocks - nremovedblocks + 1, /*lint !e747, !e776, !e834*/
               (long long) nlpineqs + 1 + i, (long long) nlpineqs + 1 + i, 1.0, checkinput);/*lint !e747*/

         if ( REALABS(sdpavarbounds[i]) > sdpisolver->epsilon )
         {
            /* the bound is added as the rhs and therefore variable zero */
#ifdef SCIP_MORE_DEBUG
            SCIPdebugMessage("         -> adding lower bound %g at (%d,%d) for variable %d which became variable %d in SDPA (%d)\n",
                  sdpavarbounds[i], nlpineqs + 1 + i, nlpineqs + 1 + i, sdpisolver->sdpatoinputmapper[-sdpisolver->varboundpos[i] - 1],
                  -sdpisolver->varboundpos[i], sdpisolver->sdpcounter);
#endif
            sdpisolver->sdpa->inputElement((long long) 0, (long long) nsdpblocks - nremovedblocks + 1, (long long) nlpineqs + 1 + i, /*lint !e747, !e776, !e834*/
                  (long long) nlpineqs + 1 + i, sdpavarbounds[i], checkinput);/*lint !e747*/
         }
         else
         {
            /* as the bound is zero, we don't need to add a right hand side */
#ifdef SCIP_MORE_DEBUG
            SCIPdebugMessage("         -> adding lower bound 0 at (%d,%d) for variable %d which became variable %d in SDPA (%d)\n",
                  nlpineqs + 1 + i, nlpineqs + 1 + i, sdpisolver->sdpatoinputmapper[-sdpisolver->varboundpos[i] - 1],
               -sdpisolver->varboundpos[i], sdpisolver->sdpcounter);
#endif
         }
      }
      else
      {
         /* this is an upper bound */

         /* add it as an lp-constraint for this variable, at the position nactivelpcons + varbound-index, because we have >= but we
          * want <= for the upper bound, we have to multiply by -1 and therefore the variable has coefficient -1 */
         sdpisolver->sdpa->inputElement((long long) sdpisolver->varboundpos[i], (long long) nsdpblocks - nremovedblocks + 1, /*lint !e747, !e776, !e834*/
               (long long) nlpineqs + 1 + i, (long long) nlpineqs + 1 + i, -1.0, checkinput);/*lint !e747*/

         if ( REALABS(sdpavarbounds[i]) > sdpisolver->epsilon )
         {
            /* the bound is added as the rhs and therefore variable zero, we multiply by -1 for <= */
#ifdef SCIP_MORE_DEBUG
            SCIPdebugMessage("         -> adding upper bound %g at (%d,%d) for variable %d which became variable %d in SDPA (%d)\n",
                  sdpavarbounds[i], nlpineqs + 1 + i, nlpineqs + 1 + i, sdpisolver->sdpatoinputmapper[sdpisolver->varboundpos[i] - 1],
                  sdpisolver->varboundpos[i], sdpisolver->sdpcounter);
#endif
            sdpisolver->sdpa->inputElement((long long) 0, (long long) nsdpblocks - nremovedblocks + 1, (long long) nlpineqs + 1 + i, /*lint !e747, !e776, !e834*/
                  (long long) nlpineqs + 1 + i, -sdpavarbounds[i], checkinput);/*lint !e747*/
         }
         else
         {
            /* as the bound is zero, we don't need to add a right hand side */
#ifdef SCIP_MORE_DEBUG
            SCIPdebugMessage("         -> adding upper bound 0 at (%d,%d) for variable %d which became variable %d in SDPA (%d)\n",
                  0, nlpineqs + 1 + i, nlpineqs + 1 + i, sdpisolver->sdpatoinputmapper[sdpisolver->varboundpos[i] - 1],
                  sdpisolver->varboundpos[i]);
#endif
         }
      }
   }

   if ( penaltyparam >= sdpisolver->epsilon && rbound )
   {
      /* we add the variable bound r >= 0 */
      sdpisolver->sdpa->inputElement((long long) sdpisolver->nactivevars + 1, (long long) nsdpblocks - nremovedblocks + 1, /*lint !e747, !e776, !e834*/
            (long long) nlpineqs + 1 + i, (long long) nlpineqs + 1 + i, 1.0, checkinput);/*lint !e747*/
#ifdef SCIP_MORE_DEBUG
      SCIPdebugMessage("         -> adding lower bound r >= 0 at (%d,%d)  in SDPA (%d)\n", nlpineqs + 1 + i, nlpineqs + 1 + i, sdpisolver->sdpcounter);
#endif
   }

   /* free the arrays used for counting and saving variable bounds and LP-right-hand-sides */
   BMSfreeBufferMemoryArray(sdpisolver->bufmem, &sdpavarbounds); /*lint !e647, !e737*/

   /* transform the matrices to a more efficient form */
   sdpisolver->sdpa->initializeUpperTriangle();
   sdpisolver->sdpa->initializeSolve();

   /* set the starting solution */
   if ( start != NULL && penaltyparam < sdpisolver->epsilon )
   {
      SCIPdebugMessage("Starting with a previous solution is not yet tested for the interface, only x-vector is given, not y and Z");
      for (i = 1; i <= sdpisolver->nactivevars; i++) /* we iterate over the variables in sdpa */
         sdpisolver->sdpa->inputInitXVec((long long) i, start[sdpisolver->sdpatoinputmapper[i] - 1]);/*lint !e747*/
   }
   else if ( penaltyparam >= sdpisolver->epsilon )
      SCIPdebugMessage("Skipping insertion of starting point, as this is not yet supported for penalty formulation.\n");

#ifdef SCIP_DEBUG_PRINTTOFILE
   /* if necessary, dump input data and initial point */
   sdpisolver->sdpa->writeInputSparse(const_cast<char*>("sdpa.dat-s"), const_cast<char*>("%+8.3e"));
   sdpisolver->sdpa->writeInitSparse(const_cast<char*>("sdpa.ini-s"), const_cast<char*>("%+8.3e"));
#endif

   SCIPdebugMessage("Calling SDPA solve (SDP: %d)\n", sdpisolver->sdpcounter);
   sdpisolver->sdpa->solve();
   sdpisolver->solved = TRUE;

   /* update number of SDP-iterations and -calls */
   sdpisolver->niterations += (int) sdpisolver->sdpa->getIteration();
   sdpisolver->nsdpcalls += 1;

#ifdef SCIP_DEBUG
   /* print the phase value , i.e. whether solving was successfull */
   sdpisolver->sdpa->getPhaseString((char*)phase_string);
   SCIPdebugMessage("SDPA solving finished with status %s (primal and dual here are switched in contrast to our formulation)\n", phase_string);
#endif

   /* remember settings */
   if ( SCIPsdpiSolverIsAcceptable(sdpisolver) && penaltyparam < sdpisolver->epsilon )
      sdpisolver->usedsetting = SCIP_SDPSOLVERSETTING_FAST;
   else if ( penaltyparam >= sdpisolver->epsilon )
      sdpisolver->usedsetting = SCIP_SDPSOLVERSETTING_PENALTY;

   /* if the problem has been stably solved but did not reach the required feasibility tolerance, even though the solver
    * reports feasibility, resolve it with adjusted tolerance */
   SCIP_CALL( checkFeastolAndResolve(sdpisolver, penaltyparam, nvars, lb, ub, nsdpblocks, sdpblocksizes, sdpnblockvars, sdpconstnnonz,
         sdpconstnblocknonz, sdpconstrow, sdpconstcol, sdpconstval, sdpnnonz, sdpnblockvarnonz, sdpvar, sdprow, sdpcol, sdpval, indchanges,
         nremovedinds, blockindchanges, nlpcons, noldlpcons, lplhs, lprhs, rownactivevars, lpnnonz, lprow, lpcol, lpval, &feastol) );

   /* check whether problem has been stably solved, if it wasn't and we didn't yet use the default parametersettings (for the penalty formulation we do so), try
    * again with more stable parameters */
   if ( ! SCIPsdpiSolverIsAcceptable(sdpisolver) && penaltyparam < sdpisolver->epsilon &&
      (startsettings == SCIP_SDPSOLVERSETTING_UNSOLVED || startsettings == SCIP_SDPSOLVERSETTING_FAST) )
   {
      SCIPdebugMessage("Numerical troubles -- solving SDP %d again ...\n", sdpisolver->sdpcounter);

      /* initialize settings */
      sdpisolver->sdpa->setParameterType(SDPA::PARAMETER_DEFAULT);
      sdpisolver->sdpa->setParameterEpsilonStar(GAPTOLCHANGE * sdpisolver->gaptol);
      sdpisolver->sdpa->setParameterEpsilonDash(FEASTOLCHANGE * sdpisolver->sdpsolverfeastol);
      sdpisolver->sdpa->setParameterLowerBound(-1e20);
      /* set the objective limit */
      if ( ! SCIPsdpiSolverIsInfinity(sdpisolver, sdpisolver->objlimit) )
         sdpisolver->sdpa->setParameterUpperBound(sdpisolver->objlimit);
      else
         sdpisolver->sdpa->setParameterUpperBound(1e8);

      /* increase Lambda Star, this seems to help the numerics */
      sdpisolver->sdpa->setParameterLambdaStar(sdpisolver->lambdastar);

#ifdef SCIP_MORE_DEBUG
   sdpisolver->sdpa->printParameters(stdout);
#endif
      sdpisolver->sdpa->setInitPoint(false);
#ifdef SDPA_RESETPARAMS
      sdpisolver->sdpa->resetParameters();
#else
      sdpisolver->sdpa->initializeSolve();
#endif
      sdpisolver->sdpa->solve();
      sdpisolver->solved = TRUE;

      /* update number of SDP-iterations and -calls */
      sdpisolver->niterations += (int) sdpisolver->sdpa->getIteration();
      sdpisolver->nsdpcalls += 1;

      /* remember setting */
      if ( SCIPsdpiSolverIsAcceptable(sdpisolver) )
         sdpisolver->usedsetting = SCIP_SDPSOLVERSETTING_MEDIUM;

#ifdef SCIP_DEBUG
      /* print the phase value , i.e. whether solving was successfull */
      sdpisolver->sdpa->getPhaseString((char*)phase_string);
      SCIPdebugMessage("SDPA solving finished with status %s (primal and dual here are switched in contrast to our formulation)\n", phase_string);
#endif

      /* if the problem has been stably solved but did not reach the required feasibility tolerance, even though the solver
       * reports feasibility, resolve it with adjusted tolerance */
      SCIP_CALL( checkFeastolAndResolve(sdpisolver, penaltyparam, nvars, lb, ub, nsdpblocks, sdpblocksizes, sdpnblockvars, sdpconstnnonz,
            sdpconstnblocknonz, sdpconstrow, sdpconstcol, sdpconstval, sdpnnonz, sdpnblockvarnonz, sdpvar, sdprow, sdpcol, sdpval, indchanges,
            nremovedinds, blockindchanges, nlpcons, noldlpcons, lplhs, lprhs, rownactivevars, lpnnonz, lprow, lpcol, lpval, &feastol) );
   }

   /* if we still didn't converge, and did not yet use the stable settings, set the parameters even more conservativly */
   if ( (! SCIPsdpiSolverIsAcceptable(sdpisolver)) && penaltyparam < sdpisolver->epsilon &&
      (startsettings == SCIP_SDPSOLVERSETTING_UNSOLVED || startsettings == SCIP_SDPSOLVERSETTING_FAST || startsettings == SCIP_SDPSOLVERSETTING_MEDIUM) )
   {
      SCIPdebugMessage("Numerical troubles -- solving SDP %d again^2 ...\n", sdpisolver->sdpcounter);

      /* initialize settings */
      sdpisolver->sdpa->setParameterType(SDPA::PARAMETER_STABLE_BUT_SLOW);
      sdpisolver->sdpa->setParameterEpsilonStar(GAPTOLCHANGE * GAPTOLCHANGE * sdpisolver->gaptol);
      sdpisolver->sdpa->setParameterEpsilonDash(FEASTOLCHANGE * FEASTOLCHANGE * sdpisolver->sdpsolverfeastol);
      sdpisolver->sdpa->setParameterLowerBound(-1e20);
      /* set the objective limit */
      if ( ! SCIPsdpiSolverIsInfinity(sdpisolver, sdpisolver->objlimit) )
         sdpisolver->sdpa->setParameterUpperBound(sdpisolver->objlimit);
      else
         sdpisolver->sdpa->setParameterUpperBound(1e8);

      /* increase Lambda Star, this seems to help the numerics */
      sdpisolver->sdpa->setParameterLambdaStar(sdpisolver->lambdastar);

#ifdef SCIP_MORE_DEBUG
sdpisolver->sdpa->printParameters(stdout);
#endif
      sdpisolver->sdpa->setInitPoint(false);
#ifdef SDPA_RESETPARAMS
      sdpisolver->sdpa->resetParameters();
#else
      sdpisolver->sdpa->initializeSolve();
#endif
      sdpisolver->sdpa->solve();
      sdpisolver->solved = TRUE;

      /* update number of SDP-iterations and -calls */
      sdpisolver->niterations += (int) sdpisolver->sdpa->getIteration();
      sdpisolver->nsdpcalls += 1;

      /* remember setting */
      if ( SCIPsdpiSolverIsAcceptable(sdpisolver) )
         sdpisolver->usedsetting = SCIP_SDPSOLVERSETTING_STABLE;

#ifdef SCIP_DEBUG
      /* print the phase value , i.e. whether solving was successfull */
      sdpisolver->sdpa->getPhaseString((char*)phase_string);
      SCIPdebugMessage("SDPA solving finished with status %s (primal and dual here are switched in constrast to our formulation)\n", phase_string);
#endif

      /* if the problem has been stably solved but did not reach the required feasibility tolerance, even though the solver
       * reports feasibility, resolve it with adjusted tolerance */
      SCIP_CALL( checkFeastolAndResolve(sdpisolver, penaltyparam, nvars, lb, ub, nsdpblocks, sdpblocksizes, sdpnblockvars, sdpconstnnonz,
            sdpconstnblocknonz, sdpconstrow, sdpconstcol, sdpconstval, sdpnnonz, sdpnblockvarnonz, sdpvar, sdprow, sdpcol, sdpval, indchanges,
            nremovedinds, blockindchanges, nlpcons, noldlpcons, lplhs, lprhs, rownactivevars, lpnnonz, lprow, lpcol, lpval, &feastol) );
   }

#ifdef SCIP_MORE_DEBUG
   (void) fclose(fpOut);
#endif

   /* if we solved a penalty formulation, check if the solution is feasible for the original problem (which is the case iff r < feastol) */
   if ( penaltyparam >= sdpisolver->epsilon )
   {
      SCIP_Real* sdpasol;
      SCIP_Real* X;
      int b;
      int nblockssdpa;
      int nrow;
      SCIP_Real trace = 0.0;

      /* in the second case we have r as an additional variable */
      assert( (sdpisolver->nactivevars + 1 == sdpisolver->sdpa->getConstraintNumber()) );  /*lint !e776*/

      sdpasol = sdpisolver->sdpa->getResultXVec();

      /* we get r as the last variable in SDPA */
      *feasorig = (sdpasol[sdpisolver->nactivevars] < sdpisolver->feastol); /*lint !e413*/

      /* if r > 0 or we are in debug mode, also check the primal bound */
#ifdef NDEBUG
      if ( ! *feasorig && penaltybound != NULL )
      {
#endif

         SCIPdebugMessage("Solution not feasible in original problem, r = %f\n", sdpasol[sdpisolver->nactivevars]);

         /* compute Tr(X) */

         /* iterate over all blocks (SDPA starts counting at one and includes the LP block) */
         nblockssdpa = (int) sdpisolver->sdpa->getBlockNumber();
         for (b = 1; b <= nblockssdpa; b++)
         {
            /* get the block from SDPA */
            X = sdpisolver->sdpa->getResultYMat((long long) b);/*lint !e747*/
            nrow = (int) sdpisolver->sdpa->getBlockSize((long long) b);/*lint !e747*/
            assert( nrow >= 0 );

            /* if it is the LP-block, we omit the variable bounds as the penalty variable is not added to them */
            if ( sdpisolver->sdpa->getBlockType((long long) b) == SDPA::LP )/*lint !e747*/
            {
               /* iterate over all diagonal entries (until we reach the varbound part), adding them to the trace */
               for (i = 0; i < nrow - sdpisolver->nvarbounds; i++)
                  trace += X[i]; /* get entry (i+1,i+1) for the diagonal matrix X */
            }
            else
            {
               /* iterate over all diagonal entries and add them to the trace */
               for (i = 0; i < nrow; i++)
                  trace += X[i + i*nrow];/*lint !e679*/ /* get entry (i+1,i+1) in X */
            }
         }

         /* if the relative gap is smaller than the tolerance, we return equality */
         if ( (penaltyparam - trace) / penaltyparam < PENALTYBOUNDTOL )/*lint !e414*/
         {
            if ( penaltybound != NULL )
               *penaltybound = TRUE;
            SCIPdebugMessage("Tr(X) = %f == %f = Gamma, penalty formulation not exact, Gamma should be increased or problem is infeasible\n",
                  trace, penaltyparam);
         }
         else if ( penaltybound != NULL )
            *penaltybound = FALSE;

#ifdef NDEBUG
      }
#endif
   }
   return SCIP_OKAY;
}

/*
 * Solution Information Methods
 */

SCIP_Bool SCIPsdpiSolverWasSolved(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   return sdpisolver->solved;
}

SCIP_Bool SCIPsdpiSolverFeasibilityKnown(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL);
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::noINFO || phasetype == SDPA::pFEAS || phasetype == SDPA::dFEAS || phasetype == SDPA::pdINF )
      return FALSE;

   return TRUE;
}

SCIP_RETCODE SCIPsdpiSolverGetSolFeasibility(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Bool*            primalfeasible,     
   SCIP_Bool*            dualfeasible        
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   assert( primalfeasible != NULL );
   assert( dualfeasible != NULL );
   CHECK_IF_SOLVED( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   switch ( phasetype )/*lint --e{788}*/
   {
   case SDPA::pdOPT:
      *primalfeasible = TRUE;
      *dualfeasible = TRUE;
      break;
   case SDPA::pdFEAS:
      *primalfeasible = TRUE;
      *dualfeasible = TRUE;
      break;
   case SDPA::pFEAS_dINF:
      *primalfeasible = TRUE;
      *dualfeasible = FALSE;
      break;
   case SDPA::pINF_dFEAS:
      *primalfeasible = FALSE;
      *dualfeasible = TRUE;
      break;
   case SDPA::pUNBD:
      *primalfeasible = TRUE;
      *dualfeasible = FALSE;
      SCIPdebugMessage("SDPA stopped because dual objective became smaller than lower bound\n");
      break;
   case SDPA::dUNBD:
      *primalfeasible = FALSE;
      *dualfeasible = TRUE;
      SCIPdebugMessage("SDPA stopped because primal objective became bigger than upper bound\n");
      break;
   default: /* contains noInfo, pFeas, dFeas, pdInf */
      SCIPerrorMessage("SDPA doesn't know if primal and dual solutions are feasible\n");
      return SCIP_LPERROR;
   }

   return SCIP_OKAY;
}

SCIP_Bool SCIPsdpiSolverIsPrimalUnbounded(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::noINFO || phasetype == SDPA::pFEAS || phasetype == SDPA::pdINF )
   {
      SCIPdebugMessage("SDPA doesn't know if primal problem is unbounded");
      return FALSE;
   }
   else if ( phasetype ==  SDPA::pFEAS_dINF )
      return TRUE;
   else if ( phasetype == SDPA::pUNBD )
   {
      SCIPdebugMessage("SDPA was stopped because primal objective became bigger than upper bound");
      return TRUE;
   }

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsPrimalInfeasible(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::noINFO || phasetype == SDPA::dFEAS || phasetype == SDPA::pdINF )
   {
      SCIPdebugMessage("SDPA doesn't know if primal problem is infeasible");
      return FALSE;
   }
   else if ( phasetype ==  SDPA::pINF_dFEAS )
      return TRUE;
   else if ( phasetype == SDPA::dUNBD )
   {
      SCIPdebugMessage("SDPA was stopped because dual objective became smaller than lower bound");
      return TRUE;
   }

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsPrimalFeasible(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::noINFO || phasetype == SDPA::dFEAS || phasetype == SDPA::pdINF )
   {
      SCIPdebugMessage("SDPA doesn't know if primal problem is feasible");
      return FALSE;
   }
   else if ( phasetype ==  SDPA::pFEAS_dINF || phasetype == SDPA::pdOPT || phasetype == SDPA::pFEAS  || phasetype == SDPA::pdFEAS )
      return TRUE;
   else if ( phasetype == SDPA::dUNBD )
   {
      SCIPdebugMessage("SDPA was stopped because dual objective became smaller than lower bound");
      return TRUE;
   }

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsDualUnbounded(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL);
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::noINFO || phasetype == SDPA::dFEAS || phasetype == SDPA::pdINF )
   {
      SCIPdebugMessage("SDPA doesn't know if dual problem is unbounded");
      return FALSE;
   }
   else if ( phasetype ==  SDPA::pINF_dFEAS )
      return TRUE;
   else if ( phasetype == SDPA::dUNBD )
   {
      SCIPdebugMessage("SDPA was stopped because dual objective became smaller than lower bound");
      return TRUE;
   }

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsDualInfeasible(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL);
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::noINFO || phasetype == SDPA::pFEAS || phasetype == SDPA::pdINF )
   {
      SCIPdebugMessage("SDPA doesn't know if dual problem is infeasible");
      return FALSE;
   }
   else if ( phasetype ==  SDPA::pFEAS_dINF )
      return TRUE;
   else if ( phasetype == SDPA::pUNBD )
   {
      SCIPdebugMessage("SDPA was stopped because primal objective became bigger than upper bound");
      return TRUE;
   }

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsDualFeasible(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL);
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::noINFO || phasetype == SDPA::dFEAS || phasetype == SDPA::pdINF )
   {
      SCIPdebugMessage("SDPA doesn't know if primal problem is feasible");
      return FALSE;
   }
   else if ( phasetype ==  SDPA::pINF_dFEAS || phasetype == SDPA::pdOPT || phasetype == SDPA::dFEAS  || phasetype == SDPA::pdFEAS )
      return TRUE;
   else if ( phasetype == SDPA::dUNBD )
   {
      SCIPdebugMessage("SDPA was stopped because dual objective became smaller than lower bound");
      return TRUE;
   }

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsConverged(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::pdOPT )
      return TRUE;

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsObjlimExc(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::pUNBD )
      return TRUE;

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsIterlimExc(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL);
   CHECK_IF_SOLVED_BOOL( sdpisolver );

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::noINFO || phasetype == SDPA::pFEAS || phasetype == SDPA::dFEAS || phasetype == SDPA::pdFEAS )
   {
      if ( sdpisolver->sdpa->getParameterMaxIteration() == sdpisolver->sdpa->getIteration() )
         return TRUE;
   }

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsTimelimExc(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );

   return sdpisolver->timelimit;
}

int SCIPsdpiSolverGetInternalStatus(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );

   if ( sdpisolver->sdpa == NULL || (! sdpisolver->solved) )
      return -1;

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::pdOPT || phasetype == SDPA::pFEAS_dINF || phasetype == SDPA::pINF_dFEAS )
      return 0;
   if ( phasetype == SDPA::pdINF )
      return 1;
   if ( phasetype == SDPA::pUNBD)
      return 3;
   if ( phasetype == SDPA::noINFO || phasetype == SDPA::pFEAS || phasetype == SDPA::dFEAS || phasetype == SDPA::pdFEAS )
      return 4;
   else /* should include dUNBD */
      return 7;
}

SCIP_Bool SCIPsdpiSolverIsOptimal(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );

   if ( ! sdpisolver->solved )
      return FALSE;

   phasetype = sdpisolver->sdpa->getPhaseValue();

   if ( phasetype == SDPA::pdOPT )
      return TRUE;

   return FALSE;
}

SCIP_Bool SCIPsdpiSolverIsAcceptable(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   SDPA::PhaseType phasetype;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );

   if ( sdpisolver->timelimit )
      return FALSE;

   if ( ! sdpisolver->solved )
      return FALSE;

   phasetype = sdpisolver->sdpa->getPhaseValue();

   /* we are happy if we converged, or we reached the objective limit (pUNBD) or we could show that our problem is
    * infeasible [except for numerics], or unbounded */
   if ( SCIPsdpiSolverIsConverged(sdpisolver) || phasetype == SDPA::pUNBD || phasetype == SDPA::pINF_dFEAS || phasetype == SDPA::pFEAS_dINF )
      return TRUE;

   return FALSE;
}

SCIP_RETCODE SCIPsdpiSolverIgnoreInstability(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Bool*            success             
   )
{/*lint !e1784*/
   SCIPdebugMessage("Not implemented yet\n");

   return SCIP_LPERROR;
}/*lint !e715*/

SCIP_RETCODE SCIPsdpiSolverGetObjval(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real*            objval              
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   assert( objval != NULL );
   CHECK_IF_SOLVED( sdpisolver );

   *objval = sdpisolver->sdpa->getPrimalObj();

#ifndef NDEBUG
   SCIP_Real primalval = sdpisolver->sdpa->getDualObj();
   SCIP_Real gap = (REALABS(*objval - primalval) / (0.5 * (REALABS(primalval) + REALABS(*objval)))); /* duality gap used in SDPA */
   if ( gap > sdpisolver->gaptol )
      SCIPdebugMessage("Attention: got objective value (before adding values of fixed variables) of %f in SCIPsdpiSolverGetObjval, "
            "but primal objective is %f with duality gap %f!\n", *objval, primalval, gap );
#endif

   /* as we didn't add the fixed (lb = ub) variables to sdpa, we have to add their contributions to the objective by hand */
   *objval += sdpisolver->fixedvarsobjcontr;

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverGetSol(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real*            objval,             
   SCIP_Real*            dualsol,            
   int*                  dualsollength       
   )
{/*lint !e1784*/
   SCIP_Real* sdpasol;
   int v;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   assert( dualsollength != NULL );
   CHECK_IF_SOLVED( sdpisolver );

   if ( objval != NULL )
   {
      *objval = sdpisolver->sdpa->getPrimalObj();

#ifndef NDEBUG
      SCIP_Real primalval = sdpisolver->sdpa->getDualObj();
      SCIP_Real gap = (REALABS(*objval - primalval) / (0.5 * (REALABS(primalval) + REALABS(*objval)))); /* duality gap used in SDPA */
      if ( gap > sdpisolver->gaptol )
      {
         SCIPdebugMessage("Attention: got objective value (before adding values of fixed variables) of %f in SCIPsdpiSolverGetSol, "
            "but primal objective is %f with duality gap %f!\n", *objval, primalval, gap );
      }
#endif

      /* as we didn't add the fixed (lb = ub) variables to sdpa, we have to add their contributions to the objective by hand */
      *objval += sdpisolver->fixedvarsobjcontr;
   }

   if ( *dualsollength > 0 )
   {
      assert( dualsol != NULL );
      if ( *dualsollength < sdpisolver->nvars )
      {
         SCIPdebugMessage("The given array in SCIPsdpiSolverGetSol only had length %d, but %d was needed", *dualsollength, sdpisolver->nvars);
         *dualsollength = sdpisolver->nvars;

         return SCIP_OKAY;
      }

      /* get the solution from sdpa */
      assert( (sdpisolver->penalty && sdpisolver->nactivevars + 1 == sdpisolver->sdpa->getConstraintNumber()) || /*lint !e776*/
               sdpisolver->nactivevars == sdpisolver->sdpa->getConstraintNumber() ); /* in the second case we have r as an additional variable */
      sdpasol = sdpisolver->sdpa->getResultXVec();
      /* insert the entries into dualsol, for non-fixed vars we copy those from sdpa, the rest are the saved entries from inserting (they equal lb=ub) */
      for (v = 0; v < sdpisolver->nvars; v++)
      {
         if ( sdpisolver->inputtosdpamapper[v] > 0 )
         {
            /* minus one because the inputtosdpamapper gives the sdpa indices which start at one, but the array starts at 0 */
            dualsol[v] = sdpasol[sdpisolver->inputtosdpamapper[v] - 1];
         }
         else
         {
            /* this is the value that was saved when inserting, as this variable has lb=ub */
            assert( -sdpisolver->inputtosdpamapper[v] <= sdpisolver->nvars - sdpisolver->nactivevars );
            dualsol[v] = sdpisolver->fixedvarsval[(-1 * sdpisolver->inputtosdpamapper[v]) - 1]; /*lint !e679*/
         }
      }
   }
   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverGetPrimalBoundVars(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real*            lbvars,             
   SCIP_Real*            ubvars,             
   int*                  arraylength         
   )
{/*lint !e1784*/
   int i;
   SCIP_Real* X; /* block of primal solution matrix corresponding to the LP-part */
   int lpblockind;
   int nlpcons;

   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   assert( lbvars != NULL );
   assert( ubvars != NULL );
   assert( arraylength != NULL );
   assert( *arraylength >= 0 );
   CHECK_IF_SOLVED( sdpisolver );

   /* check if the arrays are long enough */
   if ( *arraylength < sdpisolver->nvars )
   {
      *arraylength = sdpisolver->nvars;
      SCIPdebugMessage("Insufficient length of array in SCIPsdpiSolverGetPrimalBoundVars (gave %d, needed %d)\n", *arraylength, sdpisolver->nvars);
      return SCIP_OKAY;
   }

   /* initialize the return-arrays with zero */
   for (i = 0; i < sdpisolver->nvars; i++)
   {
      lbvars[i] = 0.0;
      ubvars[i] = 0.0;
   }

   /* if no variable bounds were added, we return the zero vector (we do this separately, because in this case there might be no LP-block) */
   if ( sdpisolver->nvarbounds == 0 )
   {
      SCIPdebugMessage("Asked for PrimalBoundVars, but there were no variable bounds in sdpa, returning zero vector !");
      return SCIP_OKAY;
   }

   /* get the block of primal solution matrix corresponding to the LP-part from sdpa */
   lpblockind = (int) sdpisolver->sdpa->getBlockNumber(); /* the LP block is the last one and sdpa counts from one */
   assert( sdpisolver->sdpa->getBlockType((long long) lpblockind) == SDPA::LP );/*lint !e747*/
   nlpcons = (int) sdpisolver->sdpa->getBlockSize((long long) lpblockind);/*lint !e747*/
   assert( nlpcons >= 0 );

   X = sdpisolver->sdpa->getResultYMat((long long) lpblockind);/*lint !e747*/

   /* iterate over all variable bounds and insert the corresponding primal variables in the right positions of the return-arrays */
   assert( sdpisolver->nvarbounds <= 2 * sdpisolver->nvars || (sdpisolver->nvarbounds <= 2 * sdpisolver->nvars + 1 && sdpisolver->penalty ) );
   /* if we solved a penalty formulation, the last variable bound belongs to the penalty variable, which we aren't interested in here */
   for (i = 0; i < ((sdpisolver->penalty) ? sdpisolver->nvarbounds - 1 : sdpisolver->nvarbounds); i++)
   {
      if ( sdpisolver->varboundpos[i] < 0 )
      {
         /* this is a lower bound */
         /* the last nvarbounds entries correspond to the varbounds */
         lbvars[sdpisolver->sdpatoinputmapper[-1 * sdpisolver->varboundpos[i] -1]] = X[nlpcons - sdpisolver->nvarbounds + i]; /*lint !e679, !e834 */
      }
      else
      {
         /* this is an upper bound */
         /* the last nvarbounds entries correspond to the varbounds */
         ubvars[sdpisolver->sdpatoinputmapper[+1 * sdpisolver->varboundpos[i] - 1]] = X[nlpcons - sdpisolver->nvarbounds + i]; /*lint !e679, !e834 */
      }
   }

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverGetIterations(
   SCIP_SDPISOLVER*      sdpisolver,         
   int*                  iterations          
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   assert( iterations != NULL );

   *iterations = sdpisolver->niterations;

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverGetSdpCalls(
   SCIP_SDPISOLVER*      sdpisolver,         
   int*                  calls               
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   assert( sdpisolver->sdpa != NULL );
   assert( calls != NULL );

   *calls = sdpisolver->nsdpcalls;

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverSettingsUsed(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_SDPSOLVERSETTING* usedsetting        
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   assert( usedsetting != NULL );
   CHECK_IF_SOLVED(sdpisolver);

   *usedsetting = sdpisolver->usedsetting;

   return SCIP_OKAY;
}

/*
 * Numerical Methods
 */

SCIP_Real SCIPsdpiSolverInfinity(
   SCIP_SDPISOLVER*      sdpisolver          
   )
{/*lint !e1784*/
   return 1E+20; /* default infinity from SCIP */
}/*lint !e715*/

SCIP_Bool SCIPsdpiSolverIsInfinity(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real             val                 
   )
{/*lint !e1784*/
   return ( val <= -SCIPsdpiSolverInfinity(sdpisolver) || val >= SCIPsdpiSolverInfinity(sdpisolver) );
}

SCIP_RETCODE SCIPsdpiSolverGetRealpar(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_SDPPARAM         type,               
   SCIP_Real*            dval                
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );
   assert( dval != NULL );

   switch( type )/*lint --e{788}*/
   {
   case SCIP_SDPPAR_EPSILON:
      *dval = sdpisolver->epsilon;
      break;
   case SCIP_SDPPAR_GAPTOL:
         *dval = sdpisolver->gaptol;
         break;
   case SCIP_SDPPAR_FEASTOL:
      *dval = sdpisolver->feastol;
      break;
   case SCIP_SDPPAR_SDPSOLVERFEASTOL:
      *dval = sdpisolver->sdpsolverfeastol;
      break;
   case SCIP_SDPPAR_PENALTYPARAM:
      *dval = 0.0;
      SCIPdebugMessage("Parameter SCIP_SDPPAR_PENALTYPARAM not used by SDPA"); /* this parameter is only used by DSDP */
      break;
   case SCIP_SDPPAR_OBJLIMIT:
      *dval = sdpisolver->objlimit;
      break;
   case SCIP_SDPPAR_LAMBDASTAR:
      *dval = sdpisolver->lambdastar;
      break;
   default:
      return SCIP_PARAMETERUNKNOWN;
   }

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverSetRealpar(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_SDPPARAM         type,               
   SCIP_Real             dval                
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );

   switch( type )/*lint --e{788}*/
   {
   case SCIP_SDPPAR_EPSILON:
      sdpisolver->epsilon = dval;
      SCIPdebugMessage("Setting sdpisolver epsilon to %f.\n", dval);
      break;
   case SCIP_SDPPAR_GAPTOL:
         sdpisolver->gaptol = dval;
         SCIPdebugMessage("Setting sdpisolver gaptol to %f.\n", dval);
         break;
   case SCIP_SDPPAR_FEASTOL:
      sdpisolver->feastol = dval;
      SCIPdebugMessage("Setting sdpisolver feastol to %f.\n", dval);
      break;
   case SCIP_SDPPAR_SDPSOLVERFEASTOL:
      sdpisolver->sdpsolverfeastol = dval;
      SCIPdebugMessage("Setting sdpisolver sdpsolverfeastol to %f.\n", dval);
      break;
   case SCIP_SDPPAR_PENALTYPARAM:
      SCIPdebugMessage("Parameter SCIP_SDPPAR_PENALTYPARAM not used by SDPA"); /* this parameter is only used by DSDP */
      break;
   case SCIP_SDPPAR_OBJLIMIT:
      SCIPdebugMessage("Setting sdpisolver objlimit to %f.\n", dval);
      sdpisolver->objlimit = dval;
      break;
   case SCIP_SDPPAR_LAMBDASTAR:
      SCIPdebugMessage("Setting sdpisolver lambdastar parameter to %f.\n", dval);
      sdpisolver->lambdastar = dval;
      break;
   default:
      return SCIP_PARAMETERUNKNOWN;
   }

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverGetIntpar(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_SDPPARAM         type,               
   int*                  ival                
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );

   switch( type )/*lint --e{788}*/
   {
   case SCIP_SDPPAR_SDPINFO:
      *ival = (int) sdpisolver->sdpinfo;
      SCIPdebugMessage("Getting sdpisolver information output (%d).\n", *ival);
      break;
   default:
      return SCIP_PARAMETERUNKNOWN;
   }

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverSetIntpar(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_SDPPARAM         type,               
   int                   ival                
   )
{/*lint !e1784*/
   assert( sdpisolver != NULL );

   switch( type )/*lint --e{788}*/
   {
   case SCIP_SDPPAR_SDPINFO:
      sdpisolver->sdpinfo = (SCIP_Bool) ival;
      SCIPdebugMessage("Setting sdpisolver information output (%d).\n", ival);
      break;
   default:
      return SCIP_PARAMETERUNKNOWN;
   }

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverComputeLambdastar(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real             maxguess            
   )
{/*lint !e1784*/
   SCIP_Real compval;

   assert( sdpisolver != NULL );

   /* we set the value to min{max{MIN_LAMBDASTAR, LAMBDASTAR_FACTOR * MAX_GUESS}, MAX_LAMBDASTAR}, where MAX_GUESS is the maximum of the guesses
    * of the SDP-Blocks, if the define LAMBDASTAR_TWOPOINTS is set, we instead choose either LAMBDASTAR_LOW or HIGH depending on LAMBASTAR_THRESHOLD */

#ifdef LAMBDASTAR_TWOPOINTS
   if ( maxguess < LAMBDASTAR_THRESHOLD )
      compval = LAMBDASTAR_LOW;
   else
      compval = LAMBDASTAR_HIGH;
#else
      compval = LAMBDASTAR_FACTOR * maxguess;
#endif

   if ( compval < MIN_LAMBDASTAR )
   {
      sdpisolver->lambdastar = MIN_LAMBDASTAR;
      SCIPdebugMessage("Setting lambdastar to %f.\n", MIN_LAMBDASTAR);
   }
   else if ( compval > MAX_LAMBDASTAR )
   {
      sdpisolver->lambdastar = MAX_LAMBDASTAR;
      SCIPdebugMessage("Setting lambdastar to %f.\n", MAX_LAMBDASTAR);
   }
   else
   {
      sdpisolver->lambdastar = compval;
      SCIPdebugMessage("Setting lambdastar to %f.\n", compval);
   }

   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverComputePenaltyparam(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real             maxcoeff,           
   SCIP_Real*            penaltyparam        
   )
{/*lint !e1784*/
   SCIP_Real compval;

   assert( sdpisolver != NULL );
   assert( penaltyparam != NULL );

   compval = PENALTYPARAM_FACTOR * maxcoeff;

   if ( compval < MIN_PENALTYPARAM )
   {
      SCIPdebugMessage("Setting penaltyparameter to %f.\n", MIN_PENALTYPARAM);
      *penaltyparam = MIN_PENALTYPARAM;
   }
   else if ( compval > MAX_PENALTYPARAM )
   {
      SCIPdebugMessage("Setting penaltyparameter to %f.\n", MAX_PENALTYPARAM);
      *penaltyparam = MAX_PENALTYPARAM;
   }
   else
   {
      SCIPdebugMessage("Setting penaltyparameter to %f.\n", compval);
      *penaltyparam = compval;
   }
   return SCIP_OKAY;
}

SCIP_RETCODE SCIPsdpiSolverComputeMaxPenaltyparam(
   SCIP_SDPISOLVER*      sdpisolver,         
   SCIP_Real             penaltyparam,       
   SCIP_Real*            maxpenaltyparam     
   )
{/*lint !e1784*/
   SCIP_Real compval;

   assert( sdpisolver != NULL );
   assert( maxpenaltyparam != NULL );

   compval = penaltyparam * MAXPENALTYPARAM_FACTOR;

   if ( compval < MAX_MAXPENALTYPARAM )
   {
      *maxpenaltyparam = compval;
      SCIPdebugMessage("Setting maximum penaltyparameter to %f.\n", compval);
   }
   else
   {
      *maxpenaltyparam = MAX_MAXPENALTYPARAM;
      SCIPdebugMessage("Setting penaltyparameter to %f.\n", MAX_MAXPENALTYPARAM);
   }

   return SCIP_OKAY;
}

/*
 * File Interface Methods
 */

SCIP_RETCODE SCIPsdpiSolverReadSDP(
   SCIP_SDPISOLVER*      sdpisolver,         
   const char*           fname               
   )
{/*lint !e1784*/
   SCIPdebugMessage("Not implemented yet\n");
   return SCIP_LPERROR;
}/*lint !e715*/

SCIP_RETCODE SCIPsdpiSolverWriteSDP(
   SCIP_SDPISOLVER*      sdpisolver,         
   const char*           fname               
   )
{/*lint !e1784*/
   assert( fname != NULL );

   sdpisolver->sdpa->writeInputSparse(const_cast<char*>(fname), const_cast<char*>("%8.3f"));

   return SCIP_OKAY;
}