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lp_lib.c
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lp_lib.c
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/* ----------------------------------------------------------------------------------
Main library of routines for lp_solve v5.0+
----------------------------------------------------------------------------------
Author: Michel Berkelaar (to v3.2)
Kjell Eikland (v4.0 and forward)
Contact: kjell.eikland@broadpark.no
License terms: LGPL.
Requires: (see below)
Release notes:
v5.0.0 1 January 2004 First integrated and repackaged version.
v5.0.1 8 May 2004 Cumulative update since initial release;
overall functionality scope maintained.
v5.1.0 20 July 2004 Reworked lp_solve throughout to fit new
flexible matrix storage model.
---------------------------------------------------------------------------------- */
/* ---------------------------------------------------------------------------------- */
/* Main library of routines for lp_solve */
/*----------------------------------------------------------------------------------- */
#include <signal.h>
#include <string.h>
#include <float.h>
#include <math.h>
#if LoadInverseLib == TRUE
#ifdef WIN32
#include <windows.h>
#else
#include <dlfcn.h>
#endif
#endif
/* ---------------------------------------------------------------------------------- */
/* Include core and support modules via headers */
/* ---------------------------------------------------------------------------------- */
#include "lp_lib.h"
#include "commonlib.h"
#include "lp_utils.h"
#include "lp_matrix.h"
#include "lp_SOS.h"
#include "lp_Hash.h"
#include "lp_MPS.h"
#include "lp_wlp.h"
#include "lp_presolve.h"
#include "lp_scale.h"
#include "lp_simplex.h"
#include "lp_mipbb.h"
#include "lp_report.h"
#include "lp_MDO.h"
#include "lp_bit.h"
#if INVERSE_ACTIVE==INVERSE_LUMOD
#include "lp_LUMOD.h"
#elif INVERSE_ACTIVE==INVERSE_LUSOL
#include "lp_LUSOL.h"
#elif INVERSE_ACTIVE==INVERSE_GLPKLU
#include "lp_glpkLU.h"
#elif INVERSE_ACTIVE==INVERSE_ETAPFI
#include "lp_etaPFI.h"
#elif INVERSE_ACTIVE==INVERSE_LEGACY
#include "lp_etaPFI.h"
#endif
#if libBLAS > 0
#include "myblas.h"
#endif
#ifdef __BORLANDC__
#pragma hdrstop
#pragma package(smart_init)
#endif
/* ---------------------------------------------------------------------------------- */
/* Include selected basis inverse routines and price norm scalars */
/* ---------------------------------------------------------------------------------- */
#include "lp_price.h"
#include "lp_pricePSE.h"
#ifdef FORTIFY
# include "lp_fortify.h"
#endif
#define sensrejvar TRUE
/* Return lp_solve version information */
void __WINAPI lp_solve_version(int *majorversion, int *minorversion, int *release, int *build)
{
if(majorversion != NULL)
(*majorversion) = MAJORVERSION;
if(minorversion != NULL)
(*minorversion) = MINORVERSION;
if(release != NULL)
(*release) = RELEASE;
if(build != NULL)
(*build) = BUILD;
}
/* ---------------------------------------------------------------------------------- */
/* Various interaction elements */
/* ---------------------------------------------------------------------------------- */
MYBOOL __WINAPI userabort(lprec *lp, int message)
{
MYBOOL abort;
int spx_save;
spx_save = lp->spx_status;
lp->spx_status = RUNNING;
if(yieldformessages(lp) != 0) {
lp->spx_status = USERABORT;
if(lp->bb_level > 0)
lp->bb_break = TRUE;
}
if((message > 0) && (lp->usermessage != NULL) && (lp->msgmask & message))
lp->usermessage(lp, lp->msghandle, message);
abort = (MYBOOL) (lp->spx_status != RUNNING);
if(!abort)
lp->spx_status = spx_save;
return( abort );
}
STATIC int yieldformessages(lprec *lp)
{
if((lp->sectimeout > 0) &&
((timeNow()-lp->timestart)-(REAL)lp->sectimeout>0))
lp->spx_status = TIMEOUT;
if(lp->ctrlc != NULL) {
int retcode = lp->ctrlc(lp, lp->ctrlchandle);
/* Check for command to restart the B&B */
if((retcode == ACTION_RESTART) && (lp->bb_level > 1)) {
lp->bb_break = AUTOMATIC;
retcode = 0;
}
return(retcode);
}
else
return(0);
}
void __WINAPI set_outputstream(lprec *lp, FILE *stream)
{
if((lp->outstream != NULL) && (lp->outstream != stdout)) {
if(lp->streamowned)
fclose(lp->outstream);
else
fflush(lp->outstream);
}
if(stream == NULL)
lp->outstream = stdout;
else
lp->outstream = stream;
lp->streamowned = FALSE;
}
MYBOOL __WINAPI set_outputfile(lprec *lp, char *filename)
{
MYBOOL ok;
FILE *output = stdout;
ok = (MYBOOL) ((filename == NULL) || (*filename == 0) || ((output = fopen(filename,"w")) != NULL));
if(ok) {
set_outputstream(lp, output);
lp->streamowned = (MYBOOL) ((filename != NULL) && (*filename != 0));
#if 1
if((filename != NULL) && (*filename == 0))
lp->outstream = NULL;
#endif
}
return(ok);
}
REAL __WINAPI time_elapsed(lprec *lp)
{
if(lp->timeend > 0)
return(lp->timeend - lp->timestart);
else
return(timeNow() - lp->timestart);
}
void __WINAPI put_bb_nodefunc(lprec *lp, lphandleint_intfunc newnode, void *bbnodehandle)
{
lp->bb_usenode = newnode;
lp->bb_nodehandle = bbnodehandle; /* User-specified "owner process ID" */
}
void __WINAPI put_bb_branchfunc(lprec *lp, lphandleint_intfunc newbranch, void *bbbranchhandle)
{
lp->bb_usebranch = newbranch;
lp->bb_branchhandle = bbbranchhandle; /* User-specified "owner process ID" */
}
void __WINAPI put_abortfunc(lprec *lp, lphandle_intfunc newctrlc, void *ctrlchandle)
{
lp->ctrlc = newctrlc;
lp->ctrlchandle = ctrlchandle; /* User-specified "owner process ID" */
}
void __WINAPI put_logfunc(lprec *lp, lphandlestr_func newlog, void *loghandle)
{
lp->writelog = newlog;
lp->loghandle = loghandle; /* User-specified "owner process ID" */
}
void __WINAPI put_msgfunc(lprec *lp, lphandleint_func newmsg, void *msghandle, int mask)
{
lp->usermessage = newmsg;
lp->msghandle = msghandle; /* User-specified "owner process ID" */
lp->msgmask = mask;
}
/* ---------------------------------------------------------------------------------- */
/* DLL exported function */
/* ---------------------------------------------------------------------------------- */
lprec * __WINAPI read_MPS(char *filename, int options)
{
lprec *lp = NULL;
int typeMPS;
typeMPS = (options & ~0x07) >> 2;
if ((typeMPS & (MPSFIXED|MPSFREE)) == 0)
typeMPS |= MPSFIXED;
if(MPS_readfile(&lp, filename, typeMPS, options & 0x07))
return( lp );
else
return( NULL );
}
lprec * __WINAPI read_mps(FILE *filename, int options)
{
lprec *lp = NULL;
int typeMPS;
typeMPS = (options & ~0x07) >> 2;
if ((typeMPS & (MPSFIXED|MPSFREE)) == 0)
typeMPS |= MPSFIXED;
if(MPS_readhandle(&lp, filename, typeMPS, options & 0x07))
return( lp );
else
return( NULL );
}
/* #if defined develop */
lprec * __WINAPI read_mpsex(void *userhandle, read_modeldata_func read_modeldata, int options)
{
lprec *lp = NULL;
int typeMPS;
typeMPS = (options & ~0x07) >> 2;
if ((typeMPS & (MPSFIXED|MPSFREE)) == 0)
typeMPS |= MPSFIXED;
if(MPS_readex(&lp, userhandle, read_modeldata, typeMPS, options & 0x07))
return( lp );
else
return( NULL );
}
/* #endif */
lprec * __WINAPI read_freeMPS(char *filename, int options)
{
lprec *lp = NULL;
int typeMPS;
typeMPS = (options & ~0x07) >> 2;
typeMPS &= ~MPSFIXED;
typeMPS |= MPSFREE;
if(MPS_readfile(&lp, filename, typeMPS, options & 0x07))
return( lp );
else
return( NULL );
}
lprec * __WINAPI read_freemps(FILE *filename, int options)
{
lprec *lp = NULL;
int typeMPS;
typeMPS = (options & ~0x07) >> 2;
typeMPS &= ~MPSFIXED;
typeMPS |= MPSFREE;
if(MPS_readhandle(&lp, filename, typeMPS, options & 0x07))
return( lp );
else
return( NULL );
}
/* #if defined develop */
lprec * __WINAPI read_freempsex(void *userhandle, read_modeldata_func read_modeldata, int options)
{
lprec *lp = NULL;
int typeMPS;
typeMPS = (options & ~0x07) >> 2;
typeMPS &= ~MPSFIXED;
typeMPS |= MPSFREE;
if(MPS_readex(&lp, userhandle, read_modeldata, typeMPS, options & 0x07))
return( lp );
else
return( NULL );
}
/* #endif */
MYBOOL __WINAPI write_mps(lprec *lp, char *filename)
{
return(MPS_writefile(lp, MPSFIXED, filename));
}
MYBOOL __WINAPI write_MPS(lprec *lp, FILE *output)
{
return(MPS_writehandle(lp, MPSFIXED, output));
}
MYBOOL __WINAPI write_freemps(lprec *lp, char *filename)
{
return(MPS_writefile(lp, MPSFREE, filename));
}
MYBOOL __WINAPI write_freeMPS(lprec *lp, FILE *output)
{
return(MPS_writehandle(lp, MPSFREE, output));
}
MYBOOL __WINAPI write_lp(lprec *lp, char *filename)
{
return(LP_writefile(lp, filename));
}
MYBOOL __WINAPI write_LP(lprec *lp, FILE *output)
{
return(LP_writehandle(lp, output));
}
#ifndef PARSER_LP
MYBOOL __WINAPI LP_readhandle(lprec **lp, FILE *filename, int verbose, char *lp_name)
{
return(FALSE);
}
lprec * __WINAPI read_lp(FILE *filename, int verbose, char *lp_name)
{
return(NULL);
}
lprec * __WINAPI read_LP(char *filename, int verbose, char *lp_name)
{
return(NULL);
}
#endif
MYBOOL __WINAPI write_basis(lprec *lp, char *filename)
{
int typeMPS = MPSFIXED;
return( MPS_writeBAS(lp, typeMPS, filename) );
}
MYBOOL __WINAPI read_basis(lprec *lp, char *filename, char *info)
{
int typeMPS = MPSFIXED;
typeMPS = MPS_readBAS(lp, typeMPS, filename, info);
/* Code basis */
if(typeMPS) {
set_action(&lp->spx_action, ACTION_REBASE | ACTION_REINVERT | ACTION_RECOMPUTE);
lp->basis_valid = TRUE; /* Do not re-initialize basis on entering Solve */
lp->var_basic[0] = FALSE; /* Set to signal that this is a non-default basis */
}
return( (MYBOOL) typeMPS );
}
/* Write and read lp_solve parameters (placeholders) - see lp_params.c */
void __WINAPI reset_params(lprec *lp)
{
int mode;
lp->epsmachine = DEF_EPSMACHINE;
lp->epsperturb = DEF_PERTURB;
lp->lag_accept = DEF_LAGACCEPT;
set_epslevel(lp, EPS_DEFAULT);
lp->tighten_on_set = FALSE;
lp->negrange = DEF_NEGRANGE;
#if 0
lp->do_presolve = PRESOLVE_ROWS | PRESOLVE_COLS | PRESOLVE_MERGEROWS |
PRESOLVE_REDUCEGCD |
PRESOLVE_ROWDOMINATE;
#else
lp->do_presolve = PRESOLVE_NONE;
#endif
lp->presolveloops = DEF_MAXPRESOLVELOOPS;
lp->scalelimit = DEF_SCALINGLIMIT;
lp->scalemode = SCALE_INTEGERS |
#if 0
SCALE_POWER2 |
SCALE_LOGARITHMIC | SCALE_MEAN;
#else
SCALE_LINEAR | SCALE_GEOMETRIC |
SCALE_EQUILIBRATE;
#endif
lp->crashmode = CRASH_NONE;
lp->max_pivots = 0;
lp->simplex_strategy = SIMPLEX_DUAL_PRIMAL;
#define PricerDefaultOpt 1
#if PricerDefaultOpt == 1
mode = PRICER_DEVEX;
#elif PricerDefaultOpt == 2
mode = PRICER_STEEPESTEDGE;
mode |= PRICE_TRUENORMINIT;
#else
mode = PRICER_STEEPESTEDGE | PRICE_PRIMALFALLBACK;
#endif
mode |= PRICE_ADAPTIVE;
#ifdef EnableRandomizedPricing
mode |= PRICE_RANDOMIZE;
#endif
set_pivoting(lp, mode);
lp->improve = IMPROVE_DEFAULT;
lp->anti_degen = ANTIDEGEN_DEFAULT;
lp->bb_floorfirst = BRANCH_AUTOMATIC;
lp->bb_rule = NODE_DYNAMICMODE | NODE_GREEDYMODE | NODE_GAPSELECT |
#if 1
NODE_PSEUDOCOSTSELECT |
#else
NODE_PSEUDOFEASSELECT |
#endif
NODE_RCOSTFIXING;
lp->bb_limitlevel = DEF_BB_LIMITLEVEL;
lp->bb_PseudoUpdates = DEF_PSEUDOCOSTUPDATES;
lp->bb_heuristicOF = my_chsign(is_maxim(lp), MAX(DEF_INFINITE, lp->infinite));
lp->bb_breakOF = -lp->bb_heuristicOF;
lp->sectimeout = 0;
lp->solutionlimit = 1;
set_outputstream(lp, NULL); /* Set to default output stream */
lp->verbose = NORMAL;
lp->print_sol = FALSE; /* Can be FALSE, TRUE, AUTOMATIC (only non-zeros printed) */
lp->spx_trace = FALSE;
lp->lag_trace = FALSE;
lp->bb_trace = FALSE;
}
void __WINAPI unscale(lprec *lp)
{
undoscale(lp);
}
int __WINAPI solve(lprec *lp)
{
#if defined FPUexception
catchFPU(_EM_INVALID | _EM_ZERODIVIDE | _EM_OVERFLOW | _EM_UNDERFLOW);
#endif
if(has_BFP(lp)) {
lp->solvecount++;
if(is_add_rowmode(lp))
set_add_rowmode(lp, FALSE);
return(lin_solve(lp));
}
else
return( NOBFP );
}
void __WINAPI print_lp(lprec *lp)
{
REPORT_lp(lp);
}
void __WINAPI print_tableau(lprec *lp)
{
REPORT_tableau(lp);
}
void __WINAPI print_objective(lprec *lp)
{
REPORT_objective(lp);
}
void __WINAPI print_solution(lprec *lp, int columns)
{
REPORT_solution(lp, columns);
}
void __WINAPI print_constraints(lprec *lp, int columns)
{
REPORT_constraints(lp, columns);
}
void __WINAPI print_duals(lprec *lp)
{
REPORT_duals(lp);
}
void __WINAPI print_scales(lprec *lp)
{
REPORT_scales(lp);
}
MYBOOL __WINAPI print_debugdump(lprec *lp, char *filename)
{
return(REPORT_debugdump(lp, filename, (MYBOOL) (get_total_iter(lp) > 0)));
}
void __WINAPI print_str(lprec *lp, char *str)
{
report(lp, lp->verbose, "%s", str);
}
/* ---------------------------------------------------------------------------------- */
/* Parameter setting and retrieval functions */
/* ---------------------------------------------------------------------------------- */
void __WINAPI set_timeout(lprec *lp, long sectimeout)
{
lp->sectimeout = sectimeout;
}
long __WINAPI get_timeout(lprec *lp)
{
return(lp->sectimeout);
}
void __WINAPI set_verbose(lprec *lp, int verbose)
{
lp->verbose = verbose;
}
int __WINAPI get_verbose(lprec *lp)
{
return(lp->verbose);
}
void __WINAPI set_print_sol(lprec *lp, int print_sol)
{
lp->print_sol = print_sol;
}
int __WINAPI get_print_sol(lprec *lp)
{
return(lp->print_sol);
}
void __WINAPI set_debug(lprec *lp, MYBOOL debug)
{
lp->bb_trace = debug;
}
MYBOOL __WINAPI is_debug(lprec *lp)
{
return(lp->bb_trace);
}
void __WINAPI set_trace(lprec *lp, MYBOOL trace)
{
lp->spx_trace = trace;
}
MYBOOL __WINAPI is_trace(lprec *lp)
{
return(lp->spx_trace);
}
void __WINAPI set_anti_degen(lprec *lp, int anti_degen)
{
lp->anti_degen = anti_degen;
}
int __WINAPI get_anti_degen(lprec *lp)
{
return(lp->anti_degen);
}
MYBOOL __WINAPI is_anti_degen(lprec *lp, int testmask)
{
return((MYBOOL) ((lp->anti_degen == testmask) || ((lp->anti_degen & testmask) != 0)));
}
void __WINAPI set_presolve(lprec *lp, int presolvemode, int maxloops)
{
presolvemode &= ~PRESOLVE_REDUCEMIP; /* disable PRESOLVE_REDUCEMIP since it is very rare that this is effective, and also that it adds code complications and delayed presolve effects that are not captured properly. */
lp->do_presolve = presolvemode;
lp->presolveloops = maxloops;
}
int __WINAPI get_presolve(lprec *lp)
{
return(lp->do_presolve);
}
int __WINAPI get_presolveloops(lprec *lp)
{
if(lp->presolveloops < 0)
return(DEF_MAXPRESOLVELOOPS);
else if(lp->presolveloops == 0)
return(MAXINT32);
else
return(lp->presolveloops);
}
MYBOOL __WINAPI is_presolve(lprec *lp, int testmask)
{
return((MYBOOL) ((lp->do_presolve == testmask) || ((lp->do_presolve & testmask) != 0)));
}
void __WINAPI set_maxpivot(lprec *lp, int maxpivot)
{
lp->max_pivots = maxpivot;
}
int __WINAPI get_maxpivot(lprec *lp)
{
return( lp->bfp_pivotmax(lp) );
}
void __WINAPI set_bb_rule(lprec *lp, int bb_rule)
{
lp->bb_rule = bb_rule;
}
int __WINAPI get_bb_rule(lprec *lp)
{
return(lp->bb_rule);
}
/* INLINE */ MYBOOL is_bb_rule(lprec *lp, int bb_rule)
{
return( (MYBOOL) ((lp->bb_rule & NODE_STRATEGYMASK) == bb_rule) );
}
/* INLINE */ MYBOOL is_bb_mode(lprec *lp, int bb_mask)
{
return( (MYBOOL) ((lp->bb_rule & bb_mask) > 0) );
}
void __WINAPI set_action(int *actionvar, int actionmask)
{
*actionvar |= actionmask;
}
void __WINAPI clear_action(int *actionvar, int actionmask)
{
*actionvar &= ~actionmask;
}
MYBOOL __WINAPI is_action(int actionvar, int testmask)
{
return( (MYBOOL) ((actionvar & testmask) != 0) );
}
void __WINAPI set_bb_depthlimit(lprec *lp, int bb_maxlevel)
{
lp->bb_limitlevel = bb_maxlevel;
}
int __WINAPI get_bb_depthlimit(lprec *lp)
{
return(lp->bb_limitlevel);
}
void __WINAPI set_obj_bound(lprec *lp, REAL bb_heuristicOF)
{
lp->bb_heuristicOF = bb_heuristicOF;
}
REAL __WINAPI get_obj_bound(lprec *lp)
{
return(lp->bb_heuristicOF);
}
void __WINAPI set_mip_gap(lprec *lp, MYBOOL absolute, REAL mip_gap)
{
if(absolute)
lp->mip_absgap = mip_gap;
else
lp->mip_relgap = mip_gap;
}
REAL __WINAPI get_mip_gap(lprec *lp, MYBOOL absolute)
{
if(absolute)
return(lp->mip_absgap);
else
return(lp->mip_relgap);
}
MYBOOL __WINAPI set_var_branch(lprec *lp, int colnr, int branch_mode)
{
if(colnr > lp->columns || colnr < 1) {
report(lp, IMPORTANT, "set_var_branch: Column %d out of range\n", colnr);
return( FALSE );
}
if(lp->bb_varbranch == NULL) {
int i;
if(branch_mode == BRANCH_DEFAULT)
return( TRUE );
allocMYBOOL(lp, &lp->bb_varbranch, lp->columns_alloc, FALSE);
for(i = 0; i < lp->columns; i++)
lp->bb_varbranch[i] = BRANCH_DEFAULT;
}
lp->bb_varbranch[colnr - 1] = (MYBOOL) branch_mode;
return( TRUE );
}
int __WINAPI get_var_branch(lprec *lp, int colnr)
{
if(colnr > lp->columns || colnr < 1) {
report(lp, IMPORTANT, "get_var_branch: Column %d out of range\n", colnr);
return(lp->bb_floorfirst);
}
if(lp->bb_varbranch == NULL)
return(lp->bb_floorfirst);
if(lp->bb_varbranch[colnr - 1] == BRANCH_DEFAULT)
return(lp->bb_floorfirst);
else
return(lp->bb_varbranch[colnr - 1]);
}
static void set_infiniteex(lprec *lp, REAL infinite, MYBOOL init)
{
int i;
infinite = fabs(infinite);
if((init) || is_infinite(lp, lp->bb_heuristicOF))
lp->bb_heuristicOF = my_chsign(is_maxim(lp), infinite);
if((init) || is_infinite(lp, lp->bb_breakOF))
lp->bb_breakOF = my_chsign(is_maxim(lp), -infinite);
for(i = 0; i <= lp->sum; i++) {
if((!init) && is_infinite(lp, lp->orig_lowbo[i]))
lp->orig_lowbo[i] = -infinite;
if((init) || is_infinite(lp, lp->orig_upbo[i]))
lp->orig_upbo[i] = infinite;
}
lp->infinite = infinite;
}
MYBOOL __WINAPI is_infinite(lprec *lp, REAL value)
{
#if 1
return( (MYBOOL) (fabs(value) >= lp->infinite) );
#else
if(fabs(value) >= lp->infinite)
return( TRUE );
else
return( FALSE );
#endif
}
void __WINAPI set_infinite(lprec *lp, REAL infinite)
{
set_infiniteex(lp, infinite, FALSE);
}
REAL __WINAPI get_infinite(lprec *lp)
{
return(lp->infinite);
}
void __WINAPI set_epsperturb(lprec *lp, REAL epsperturb)
{
lp->epsperturb = epsperturb;
}
REAL __WINAPI get_epsperturb(lprec *lp)
{
return(lp->epsperturb);
}
void __WINAPI set_epspivot(lprec *lp, REAL epspivot)
{
lp->epspivot = epspivot;
}
REAL __WINAPI get_epspivot(lprec *lp)
{
return(lp->epspivot);
}
void __WINAPI set_epsint(lprec *lp, REAL epsint)
{
lp->epsint = epsint;
}
REAL __WINAPI get_epsint(lprec *lp)
{
return(lp->epsint);
}
void __WINAPI set_epsb(lprec *lp, REAL epsb)
{
lp->epsprimal = MAX(epsb, lp->epsmachine);
}
REAL __WINAPI get_epsb(lprec *lp)
{
return(lp->epsprimal);
}
void __WINAPI set_epsd(lprec *lp, REAL epsd)
{
lp->epsdual = MAX(epsd, lp->epsmachine); /* Mainly used as tolerance for reduced cost */
}
REAL __WINAPI get_epsd(lprec *lp)
{
return(lp->epsdual);
}
void __WINAPI set_epsel(lprec *lp, REAL epsel)
{
lp->epsvalue = MAX(epsel, lp->epsmachine);
}
REAL __WINAPI get_epsel(lprec *lp)
{
return(lp->epsvalue);
}
MYBOOL __WINAPI set_epslevel(lprec *lp, int epslevel)
{
REAL SPX_RELAX, MIP_RELAX;
switch(epslevel) {
case EPS_TIGHT: SPX_RELAX = 1;
MIP_RELAX = 1;
break;
case EPS_MEDIUM: SPX_RELAX = 10;
MIP_RELAX = 1;
break;
case EPS_LOOSE: SPX_RELAX = 100;
MIP_RELAX = 10;
break;
case EPS_BAGGY: SPX_RELAX = 1000;
MIP_RELAX = 100;
break;
default: return( FALSE );
}
lp->epsvalue = SPX_RELAX*DEF_EPSVALUE;
lp->epsprimal = SPX_RELAX*DEF_EPSPRIMAL;
lp->epsdual = SPX_RELAX*DEF_EPSDUAL;
lp->epspivot = SPX_RELAX*DEF_EPSPIVOT;
lp->epssolution= MIP_RELAX*DEF_EPSSOLUTION;
lp->epsint = MIP_RELAX*DEF_EPSINT;
lp->mip_absgap = MIP_RELAX*DEF_MIP_GAP;
lp->mip_relgap = MIP_RELAX*DEF_MIP_GAP;
return( TRUE );
}
void __WINAPI set_scaling(lprec *lp, int scalemode)
{
lp->scalemode = scalemode;
}
int __WINAPI get_scaling(lprec *lp)
{
return(lp->scalemode);
}
MYBOOL __WINAPI is_scalemode(lprec *lp, int testmask)
{
return((MYBOOL) ((lp->scalemode & testmask) != 0));
}
MYBOOL __WINAPI is_scaletype(lprec *lp, int scaletype)
{
int testtype;
testtype = lp->scalemode & SCALE_MAXTYPE;
return((MYBOOL) (scaletype == testtype));
}
void __WINAPI set_scalelimit(lprec *lp, REAL scalelimit)
/* Set the relative scaling convergence criterion for the active scaling mode;
the integer part specifies the maximum number of iterations (default = 5). */
{
lp->scalelimit = fabs(scalelimit);
}
REAL __WINAPI get_scalelimit(lprec *lp)
{
return(lp->scalelimit);
}
MYBOOL __WINAPI is_integerscaling(lprec *lp)
{
return(is_scalemode(lp, SCALE_INTEGERS));
}
void __WINAPI set_improve(lprec *lp, int improve)
{
lp->improve = improve;
}
int __WINAPI get_improve(lprec *lp)
{
return(lp->improve);
}
void __WINAPI set_lag_trace(lprec *lp, MYBOOL lag_trace)
{
lp->lag_trace = lag_trace;
}
MYBOOL __WINAPI is_lag_trace(lprec *lp)
{
return(lp->lag_trace);
}
void __WINAPI set_pivoting(lprec *lp, int pivoting)
{
/* Set new pivoting strategy */
lp->piv_strategy = pivoting;
report(lp, DETAILED, "set_pivoting: Pricing strategy set to '%s'\n",
get_str_piv_rule(get_piv_rule(lp)));
}
int __WINAPI get_pivoting(lprec *lp)
{
return( lp->piv_strategy );
}
/* INLINE */ int get_piv_rule(lprec *lp)
{
return( (lp->piv_strategy | PRICE_STRATEGYMASK) ^ PRICE_STRATEGYMASK );
}
STATIC char *get_str_piv_rule(int rule)
{
static char *pivotText[PRICER_LASTOPTION+1] =
{"Bland first index", "Dantzig", "Devex", "Steepest Edge"};
return( pivotText[rule] );
}
MYBOOL __WINAPI is_piv_rule(lprec *lp, int rule)
{
return( (MYBOOL) (get_piv_rule(lp) == rule) );
}
MYBOOL __WINAPI is_piv_mode(lprec *lp, int testmask)
{
return((MYBOOL) (((testmask & PRICE_STRATEGYMASK) != 0) &&
((lp->piv_strategy & testmask) != 0)));
}
void __WINAPI set_break_at_first(lprec *lp, MYBOOL break_at_first)
{
lp->bb_breakfirst = break_at_first;
}
MYBOOL __WINAPI is_break_at_first(lprec *lp)
{
return(lp->bb_breakfirst);
}
void __WINAPI set_bb_floorfirst(lprec *lp, int bb_floorfirst)
{
lp->bb_floorfirst = (MYBOOL) bb_floorfirst;
}
int __WINAPI get_bb_floorfirst(lprec *lp)
{
return(lp->bb_floorfirst);
}
void __WINAPI set_break_at_value(lprec *lp, REAL break_at_value)
{
lp->bb_breakOF = break_at_value;
}
REAL __WINAPI get_break_at_value(lprec *lp)
{
return(lp->bb_breakOF);
}
void __WINAPI set_negrange(lprec *lp, REAL negrange)
{
if(negrange <= 0)
lp->negrange = negrange;
else
lp->negrange = 0.0;
}
REAL __WINAPI get_negrange(lprec *lp)
{
return(lp->negrange);
}
int __WINAPI get_max_level(lprec *lp)
{
return(lp->bb_maxlevel);
}
COUNTER __WINAPI get_total_nodes(lprec *lp)
{
return(lp->bb_totalnodes);
}
COUNTER __WINAPI get_total_iter(lprec *lp)
{
return(lp->total_iter + lp->current_iter);
}
REAL __WINAPI get_objective(lprec *lp)
{
if(lp->spx_status == OPTIMAL)
;