Detailed Description

LP interface for Xpress-MP.

Author: Tobias Achterberg; Michael Perregaard; Livio Bertacco; Stefan Heinz

This interface was revised for Xpress 26. Therefore, we removed all legacy code.

Xpress requires that column and row names are unique. Since column and row names are not needed we ignore all column and row names to avoid the uniqueness issue.

Definition in file lpi_xprs.c.

#include <assert.h>
#include <string.h>
#include <strings.h>
#include "xprs.h"
#include "scip/bitencode.h"
#include "scip/pub_misc.h"
#include "scip/pub_message.h"
#include "lpi/lpi.h"
#include "tinycthread/tinycthread.h"

Go to the source code of this file.

Data Structures
struct	SCIP_LPi
struct	SCIP_LPiState

Macros
#define	XPRS_LPQUICKPRESOLVE 8207
#define	XPRS_LP_OPTIMAL_SCALEDINFEAS 16
#define	CHECK_ZERO(messagehdlr, x)
#define	ABORT_ZERO(messagehdlr, retval, x)
#define	COLS_PER_PACKET SCIP_DUALPACKETSIZE
#define	ROWS_PER_PACKET SCIP_DUALPACKETSIZE

Functions
static void	invalidateSolution (SCIP_LPI *lpi)
Debug check methods
static void	debugCheckColrang (SCIP_LPI *lpi, int firstcol, int lastcol)
static void	debugCheckRowrang (SCIP_LPI *lpi, int firstrow, int lastrow)
Dynamic memory arrays
static SCIP_RETCODE	ensureBoundchgMem (SCIP_LPI *lpi, int num)
static SCIP_RETCODE	ensureSidechgMem (SCIP_LPI *lpi, int num)
static SCIP_RETCODE	ensureValMem (SCIP_LPI *lpi, int num)
static SCIP_RETCODE	ensureCstatMem (SCIP_LPI *lpi, int num)
static SCIP_RETCODE	ensureRstatMem (SCIP_LPI *lpi, int num)
LPi state methods
static int	colpacketNum (int ncols)
static int	rowpacketNum (int nrows)
static void	lpistatePack (SCIP_LPISTATE lpistate, const int cstat, const int *rstat)
static void	lpistateUnpack (const SCIP_LPISTATE lpistate, int cstat, int *rstat)
static SCIP_RETCODE	lpistateCreate (SCIP_LPISTATE *lpistate, BMS_BLKMEM blkmem, int ncols, int nrows)
static void	lpistateFree (SCIP_LPISTATE *lpistate, BMS_BLKMEM blkmem)
Conversion methods
static int	xprsObjsen (SCIP_OBJSEN const objsen)
static void	convertSides (SCIP_LPI lpi, int nrows, const SCIP_Real lhss, const SCIP_Real *rhss)
static void	reconvertBothSides (SCIP_LPI lpi, int nrows, SCIP_Real lhss, SCIP_Real *rhss)
static void	reconvertLhs (SCIP_LPI lpi, int nrows, SCIP_Real lhss)
static void	reconvertRhs (SCIP_LPI lpi, int nrows, SCIP_Real rhss)
static void	reconvertSides (SCIP_LPI lpi, int nrows, SCIP_Real lhs, SCIP_Real *rhs)
LPI Creation and Destruction Methods
SCIP_RETCODE	SCIPlpiCreate (SCIP_LPI *lpi, SCIP_MESSAGEHDLR messagehdlr, const char *name, SCIP_OBJSEN objsen)
SCIP_RETCODE	SCIPlpiFree (SCIP_LPI **lpi)
Modification Methods
SCIP_RETCODE	SCIPlpiLoadColLP (SCIP_LPI lpi, SCIP_OBJSEN objsen, int ncols, const SCIP_Real obj, const SCIP_Real lb, const SCIP_Real ub, char *colnames, int nrows, const SCIP_Real lhs, const SCIP_Real rhs, char rownames, int nnonz, const int beg, const int ind, const SCIP_Real val)
SCIP_RETCODE	SCIPlpiAddCols (SCIP_LPI lpi, int ncols, const SCIP_Real obj, const SCIP_Real lb, const SCIP_Real ub, char *colnames, int nnonz, const int beg, const int ind, const SCIP_Real val)
SCIP_RETCODE	SCIPlpiDelCols (SCIP_LPI *lpi, int firstcol, int lastcol)
SCIP_RETCODE	SCIPlpiDelColset (SCIP_LPI lpi, int dstat)
SCIP_RETCODE	SCIPlpiAddRows (SCIP_LPI lpi, int nrows, const SCIP_Real lhs, const SCIP_Real rhs, char rownames, int nnonz, const int beg, const int ind, const SCIP_Real val)
SCIP_RETCODE	SCIPlpiDelRows (SCIP_LPI *lpi, int firstrow, int lastrow)
SCIP_RETCODE	SCIPlpiDelRowset (SCIP_LPI lpi, int dstat)
SCIP_RETCODE	SCIPlpiClear (SCIP_LPI *lpi)
SCIP_RETCODE	SCIPlpiChgBounds (SCIP_LPI lpi, int ncols, const int ind, const SCIP_Real lb, const SCIP_Real ub)
SCIP_RETCODE	SCIPlpiChgSides (SCIP_LPI lpi, int nrows, const int ind, const SCIP_Real lhs, const SCIP_Real rhs)
SCIP_RETCODE	SCIPlpiChgCoef (SCIP_LPI *lpi, int row, int col, SCIP_Real newval)
SCIP_RETCODE	SCIPlpiChgObjsen (SCIP_LPI *lpi, SCIP_OBJSEN objsen)
SCIP_RETCODE	SCIPlpiChgObj (SCIP_LPI lpi, int ncols, const int ind, const SCIP_Real *obj)
SCIP_RETCODE	SCIPlpiScaleRow (SCIP_LPI *lpi, int row, SCIP_Real scaleval)
SCIP_RETCODE	SCIPlpiScaleCol (SCIP_LPI *lpi, int col, SCIP_Real scaleval)
Data Accessing Methods
SCIP_RETCODE	SCIPlpiGetNRows (SCIP_LPI lpi, int nrows)
SCIP_RETCODE	SCIPlpiGetNCols (SCIP_LPI lpi, int ncols)
SCIP_RETCODE	SCIPlpiGetNNonz (SCIP_LPI lpi, int nnonz)
SCIP_RETCODE	SCIPlpiGetCols (SCIP_LPI lpi, int firstcol, int lastcol, SCIP_Real lb, SCIP_Real ub, int nnonz, int beg, int ind, SCIP_Real *val)
SCIP_RETCODE	SCIPlpiGetRows (SCIP_LPI lpi, int firstrow, int lastrow, SCIP_Real lhs, SCIP_Real rhs, int nnonz, int beg, int ind, SCIP_Real *val)
SCIP_RETCODE	SCIPlpiGetColNames (SCIP_LPI lpi, int firstcol, int lastcol, char colnames, char namestorage, int namestoragesize, int *storageleft)
SCIP_RETCODE	SCIPlpiGetRowNames (SCIP_LPI lpi, int firstrow, int lastrow, char rownames, char namestorage, int namestoragesize, int *storageleft)
SCIP_RETCODE	SCIPlpiGetObjsen (SCIP_LPI lpi, SCIP_OBJSEN objsen)
SCIP_RETCODE	SCIPlpiGetObj (SCIP_LPI lpi, int firstcol, int lastcol, SCIP_Real vals)
SCIP_RETCODE	SCIPlpiGetBounds (SCIP_LPI lpi, int firstcol, int lastcol, SCIP_Real lbs, SCIP_Real *ubs)
SCIP_RETCODE	SCIPlpiGetSides (SCIP_LPI lpi, int firstrow, int lastrow, SCIP_Real lhss, SCIP_Real *rhss)
SCIP_RETCODE	SCIPlpiGetCoef (SCIP_LPI lpi, int row, int col, SCIP_Real val)
Solving Methods
static SCIP_RETCODE	lpiSolve (SCIP_LPI lpi, const char method)
SCIP_RETCODE	SCIPlpiSolvePrimal (SCIP_LPI *lpi)
SCIP_RETCODE	SCIPlpiSolveDual (SCIP_LPI *lpi)
SCIP_RETCODE	SCIPlpiSolveBarrier (SCIP_LPI *lpi, SCIP_Bool crossover)
SCIP_RETCODE	SCIPlpiStartStrongbranch (SCIP_LPI *lpi)
SCIP_RETCODE	SCIPlpiEndStrongbranch (SCIP_LPI *lpi)
static SCIP_RETCODE	lpiStrongbranch (SCIP_LPI lpi, int col, SCIP_Real psol, int itlim, SCIP_Real down, SCIP_Real up, SCIP_Bool downvalid, SCIP_Bool upvalid, int iter)
static SCIP_RETCODE	lpiStrongbranches (SCIP_LPI lpi, int cols, int ncols, SCIP_Real psols, int itlim, SCIP_Real down, SCIP_Real up, SCIP_Bool downvalid, SCIP_Bool upvalid, int iter)
SCIP_RETCODE	SCIPlpiStrongbranchFrac (SCIP_LPI lpi, int col, SCIP_Real psol, int itlim, SCIP_Real down, SCIP_Real up, SCIP_Bool downvalid, SCIP_Bool upvalid, int iter)
SCIP_RETCODE	SCIPlpiStrongbranchesFrac (SCIP_LPI lpi, int cols, int ncols, SCIP_Real psols, int itlim, SCIP_Real down, SCIP_Real up, SCIP_Bool downvalid, SCIP_Bool upvalid, int iter)
SCIP_RETCODE	SCIPlpiStrongbranchInt (SCIP_LPI lpi, int col, SCIP_Real psol, int itlim, SCIP_Real down, SCIP_Real up, SCIP_Bool downvalid, SCIP_Bool upvalid, int iter)
SCIP_RETCODE	SCIPlpiStrongbranchesInt (SCIP_LPI lpi, int cols, int ncols, SCIP_Real psols, int itlim, SCIP_Real down, SCIP_Real up, SCIP_Bool downvalid, SCIP_Bool upvalid, int iter)
Solution Information Methods
SCIP_Bool	SCIPlpiWasSolved (SCIP_LPI *lpi)
SCIP_RETCODE	SCIPlpiGetSolFeasibility (SCIP_LPI lpi, SCIP_Bool primalfeasible, SCIP_Bool *dualfeasible)
SCIP_Bool	SCIPlpiExistsPrimalRay (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiHasPrimalRay (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsPrimalUnbounded (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsPrimalInfeasible (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsPrimalFeasible (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiExistsDualRay (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiHasDualRay (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsDualUnbounded (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsDualInfeasible (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsDualFeasible (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsOptimal (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsStable (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsObjlimExc (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsIterlimExc (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsTimelimExc (SCIP_LPI *lpi)
int	SCIPlpiGetInternalStatus (SCIP_LPI *lpi)
SCIP_RETCODE	SCIPlpiIgnoreInstability (SCIP_LPI lpi, SCIP_Bool success)
SCIP_RETCODE	SCIPlpiGetObjval (SCIP_LPI lpi, SCIP_Real objval)
SCIP_RETCODE	SCIPlpiGetSol (SCIP_LPI lpi, SCIP_Real objval, SCIP_Real primsol, SCIP_Real dualsol, SCIP_Real activity, SCIP_Real redcost)
SCIP_RETCODE	SCIPlpiGetPrimalRay (SCIP_LPI lpi, SCIP_Real ray)
SCIP_RETCODE	SCIPlpiGetDualfarkas (SCIP_LPI lpi, SCIP_Real dualfarkas)
SCIP_RETCODE	SCIPlpiGetIterations (SCIP_LPI lpi, int iterations)
SCIP_RETCODE	SCIPlpiGetRealSolQuality (SCIP_LPI lpi, SCIP_LPSOLQUALITY qualityindicator, SCIP_Real quality)
LP Basis Methods
SCIP_RETCODE	SCIPlpiGetBase (SCIP_LPI lpi, int cstat, int *rstat)
SCIP_RETCODE	SCIPlpiSetBase (SCIP_LPI lpi, const int cstat, const int *rstat)
SCIP_RETCODE	SCIPlpiGetBasisInd (SCIP_LPI lpi, int bind)
SCIP_RETCODE	SCIPlpiGetBInvRow (SCIP_LPI lpi, int r, SCIP_Real coef, int inds, int ninds)
SCIP_RETCODE	SCIPlpiGetBInvCol (SCIP_LPI lpi, int c, SCIP_Real coef, int inds, int ninds)
SCIP_RETCODE	SCIPlpiGetBInvARow (SCIP_LPI lpi, int r, const SCIP_Real binvrow, SCIP_Real coef, int inds, int *ninds)
SCIP_RETCODE	SCIPlpiGetBInvACol (SCIP_LPI lpi, int c, SCIP_Real coef, int inds, int ninds)
LP State Methods
SCIP_RETCODE	SCIPlpiGetState (SCIP_LPI lpi, BMS_BLKMEM blkmem, SCIP_LPISTATE **lpistate)
SCIP_RETCODE	SCIPlpiSetState (SCIP_LPI lpi, BMS_BLKMEM blkmem, const SCIP_LPISTATE *lpistate)
SCIP_RETCODE	SCIPlpiClearState (SCIP_LPI *lpi)
SCIP_RETCODE	SCIPlpiFreeState (SCIP_LPI lpi, BMS_BLKMEM blkmem, SCIP_LPISTATE **lpistate)
SCIP_Bool	SCIPlpiHasStateBasis (SCIP_LPI lpi, SCIP_LPISTATE lpistate)
SCIP_RETCODE	SCIPlpiReadState (SCIP_LPI lpi, const char fname)
SCIP_RETCODE	SCIPlpiWriteState (SCIP_LPI lpi, const char fname)
LP Pricing Norms Methods
SCIP_RETCODE	SCIPlpiGetNorms (SCIP_LPI lpi, BMS_BLKMEM blkmem, SCIP_LPINORMS **lpinorms)
SCIP_RETCODE	SCIPlpiSetNorms (SCIP_LPI lpi, BMS_BLKMEM blkmem, const SCIP_LPINORMS *lpinorms)
SCIP_RETCODE	SCIPlpiFreeNorms (SCIP_LPI lpi, BMS_BLKMEM blkmem, SCIP_LPINORMS **lpinorms)
Parameter Methods
SCIP_RETCODE	SCIPlpiGetIntpar (SCIP_LPI lpi, SCIP_LPPARAM type, int ival)
SCIP_RETCODE	SCIPlpiSetIntpar (SCIP_LPI *lpi, SCIP_LPPARAM type, int ival)
SCIP_RETCODE	SCIPlpiGetRealpar (SCIP_LPI lpi, SCIP_LPPARAM type, SCIP_Real dval)
SCIP_RETCODE	SCIPlpiSetRealpar (SCIP_LPI *lpi, SCIP_LPPARAM type, SCIP_Real dval)
SCIP_RETCODE	SCIPlpiInterrupt (SCIP_LPI *lpi, SCIP_Bool interrupt)
Numerical Methods
SCIP_Real	SCIPlpiInfinity (SCIP_LPI *lpi)
SCIP_Bool	SCIPlpiIsInfinity (SCIP_LPI *lpi, SCIP_Real val)
File Interface Methods
SCIP_RETCODE	SCIPlpiReadLP (SCIP_LPI lpi, const char fname)
SCIP_RETCODE	SCIPlpiWriteLP (SCIP_LPI lpi, const char fname)

Miscellaneous Methods
static _Thread_local char	xprsname [100]
const char *	SCIPlpiGetSolverName (void)
const char *	SCIPlpiGetSolverDesc (void)
void *	SCIPlpiGetSolverPointer (SCIP_LPI *lpi)
SCIP_RETCODE	SCIPlpiSetIntegralityInformation (SCIP_LPI lpi, int ncols, int intInfo)
SCIP_Bool	SCIPlpiHasPrimalSolve (void)
SCIP_Bool	SCIPlpiHasDualSolve (void)
SCIP_Bool	SCIPlpiHasBarrierSolve (void)

Macro Definition Documentation

◆ XPRS_LPQUICKPRESOLVE

#define XPRS_LPQUICKPRESOLVE 8207

Definition at line 57 of file lpi_xprs.c.

Referenced by lpiSolve().

◆ XPRS_LP_OPTIMAL_SCALEDINFEAS

#define XPRS_LP_OPTIMAL_SCALEDINFEAS 16

Definition at line 61 of file lpi_xprs.c.

Referenced by lpiSolve(), SCIPlpiIsDualFeasible(), SCIPlpiIsOptimal(), SCIPlpiIsPrimalFeasible(), and SCIPlpiIsStable().

◆ CHECK_ZERO

#define CHECK_ZERO	(		messagehdlr,
			x )

Value:

      { int _restat_;                      \
      if( (_restat_ = (x)) != 0 )                                       \
      {                                                                 \
         SCIPmessagePrintWarning((messagehdlr), "%s:%d: LP Error: Xpress returned %d\n", __FILE__, __LINE__, _restat_); \
         return SCIP_LPERROR;                                           \
      }                                                                 \
   }

Definition at line 63 of file lpi_xprs.c.

Referenced by lpiSolve(), lpiStrongbranch(), lpiStrongbranches(), SCIPlpiAddCols(), SCIPlpiAddRows(), SCIPlpiChgBounds(), SCIPlpiChgCoef(), SCIPlpiChgObj(), SCIPlpiChgObjsen(), SCIPlpiChgSides(), SCIPlpiClear(), SCIPlpiCreate(), SCIPlpiDelCols(), SCIPlpiDelColset(), SCIPlpiDelRows(), SCIPlpiDelRowset(), SCIPlpiFree(), SCIPlpiGetBase(), SCIPlpiGetBasisInd(), SCIPlpiGetBInvACol(), SCIPlpiGetBInvARow(), SCIPlpiGetBInvCol(), SCIPlpiGetBInvRow(), SCIPlpiGetBounds(), SCIPlpiGetCoef(), SCIPlpiGetCols(), SCIPlpiGetDualfarkas(), SCIPlpiGetIntpar(), SCIPlpiGetNCols(), SCIPlpiGetNNonz(), SCIPlpiGetNRows(), SCIPlpiGetObj(), SCIPlpiGetObjsen(), SCIPlpiGetObjval(), SCIPlpiGetPrimalRay(), SCIPlpiGetRealpar(), SCIPlpiGetRows(), SCIPlpiGetSides(), SCIPlpiGetSol(), SCIPlpiGetState(), SCIPlpiLoadColLP(), SCIPlpiReadLP(), SCIPlpiReadState(), SCIPlpiScaleCol(), SCIPlpiScaleRow(), SCIPlpiSetBase(), SCIPlpiSetIntpar(), SCIPlpiSetRealpar(), SCIPlpiSetState(), SCIPlpiSolveBarrier(), SCIPlpiWriteLP(), and SCIPlpiWriteState().

◆ ABORT_ZERO

#define ABORT_ZERO	(	messagehdlr,
		retval,
		x )

Value:

      { int _restat_;              \
      if( (_restat_ = (x)) != 0 )                                       \
      {                                                                 \
         SCIPmessagePrintWarning((messagehdlr), "LP Error: Xpress returned %d\n", _restat_); \
         SCIPABORT();                                                   \
         return retval;                                                 \
      }                                                                 \
   }

Definition at line 72 of file lpi_xprs.c.

Referenced by SCIPlpiHasDualRay(), SCIPlpiHasPrimalRay(), SCIPlpiIsDualFeasible(), SCIPlpiIsIterlimExc(), SCIPlpiIsPrimalFeasible(), and SCIPlpiIsTimelimExc().

◆ COLS_PER_PACKET

#define COLS_PER_PACKET SCIP_DUALPACKETSIZE

Definition at line 83 of file lpi_xprs.c.

◆ ROWS_PER_PACKET

#define ROWS_PER_PACKET SCIP_DUALPACKETSIZE

Definition at line 85 of file lpi_xprs.c.

Function Documentation

◆ debugCheckColrang()

void debugCheckColrang	(	SCIP_LPI *	lpi,
		int	firstcol,
		int	lastcol )

static

check that the column range fits

Parameters

lpi	LP interface structure
firstcol	first column to be deleted
lastcol	last column to be deleted

Definition at line 144 of file lpi_xprs.c.

References assert(), NULL, and SCIP_LPi::xprslp.

Referenced by SCIPlpiDelCols(), SCIPlpiGetBounds(), SCIPlpiGetColNames(), SCIPlpiGetCols(), and SCIPlpiGetObj().

◆ debugCheckRowrang()

void debugCheckRowrang	(	SCIP_LPI *	lpi,
		int	firstrow,
		int	lastrow )

static

check that the row range fits

Parameters

lpi	LP interface structure
firstrow	first row to be deleted
lastrow	last row to be deleted

Definition at line 161 of file lpi_xprs.c.

References assert(), NULL, and SCIP_LPi::xprslp.

Referenced by SCIPlpiDelRows(), SCIPlpiGetRowNames(), SCIPlpiGetRows(), and SCIPlpiGetSides().

◆ ensureBoundchgMem()

SCIP_RETCODE ensureBoundchgMem	(	SCIP_LPI *	lpi,
		int	num )

static

resizes larray and uarray to have at least num entries and fill it with 'L' and 'U' for the lower and upper bound markers

Parameters

lpi	LP interface structure
num	minimal number of entries in array

Definition at line 195 of file lpi_xprs.c.

References assert(), BMSreallocMemoryArray, SCIP_LPi::boundchgsize, i, SCIP_LPi::larray, MAX, NULL, SCIP_ALLOC, SCIP_OKAY, and SCIP_LPi::uarray.

Referenced by SCIPlpiChgBounds().

◆ ensureSidechgMem()

SCIP_RETCODE ensureSidechgMem	(	SCIP_LPI *	lpi,
		int	num )

static

resizes senarray, rngarray, and rhsarray to have at least num entries

Parameters

lpi	LP interface structure
num	minimal number of entries in array

Definition at line 224 of file lpi_xprs.c.

References assert(), BMSreallocMemoryArray, MAX, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_ALLOC, SCIP_OKAY, SCIP_LPi::senarray, and SCIP_LPi::sidechgsize.

Referenced by SCIPlpiAddRows(), SCIPlpiChgSides(), SCIPlpiGetSides(), SCIPlpiGetSol(), and SCIPlpiLoadColLP().

◆ ensureValMem()

SCIP_RETCODE ensureValMem	(	SCIP_LPI *	lpi,
		int	num )

static

resizes valarray and indarray to have at least num entries

Parameters

lpi	LP interface structure
num	minimal number of entries in array

Definition at line 248 of file lpi_xprs.c.

References assert(), BMSreallocMemoryArray, SCIP_LPi::indarray, MAX, NULL, SCIP_ALLOC, SCIP_OKAY, SCIP_LPi::valarray, and SCIP_LPi::valsize.

Referenced by SCIPlpiAddCols(), SCIPlpiAddRows(), SCIPlpiDelCols(), SCIPlpiDelColset(), SCIPlpiDelRows(), SCIPlpiDelRowset(), SCIPlpiGetBInvACol(), SCIPlpiGetBInvARow(), SCIPlpiGetCols(), SCIPlpiGetRows(), SCIPlpiLoadColLP(), SCIPlpiScaleCol(), and SCIPlpiScaleRow().

◆ ensureCstatMem()

SCIP_RETCODE ensureCstatMem	(	SCIP_LPI *	lpi,
		int	num )

static

resizes cstat array to have at least num entries

Parameters

lpi	LP interface structure
num	minimal number of entries in array

Definition at line 271 of file lpi_xprs.c.

References assert(), BMSreallocMemoryArray, SCIP_LPi::cstat, SCIP_LPi::cstatsize, MAX, NULL, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpiGetState(), and SCIPlpiSetState().

◆ ensureRstatMem()

SCIP_RETCODE ensureRstatMem	(	SCIP_LPI *	lpi,
		int	num )

static

resizes rstat array to have at least num entries

Parameters

lpi	LP interface structure
num	minimal number of entries in array

Definition at line 293 of file lpi_xprs.c.

References assert(), BMSreallocMemoryArray, MAX, NULL, SCIP_LPi::rstat, SCIP_LPi::rstatsize, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpiGetState(), and SCIPlpiSetState().

◆ colpacketNum()

int colpacketNum ( int ncols )

static

returns the number of packets needed to store column packet information

Parameters

ncols number of columns to store

Definition at line 323 of file lpi_xprs.c.

References COLS_PER_PACKET.

◆ rowpacketNum()

int rowpacketNum ( int nrows )

static

returns the number of packets needed to store row packet information

Parameters

nrows number of rows to store

Definition at line 332 of file lpi_xprs.c.

References ROWS_PER_PACKET.

◆ lpistatePack()

void lpistatePack	(	SCIP_LPISTATE *	lpistate,
		const int *	cstat,
		const int *	rstat )

static

store row and column basis status in a packed LPi state object

Parameters

lpistate	pointer to LPi state data
cstat	basis status of columns in unpacked format
rstat	basis status of rows in unpacked format (row status w.r.t. slack columns)

Definition at line 341 of file lpi_xprs.c.

References assert(), SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, SCIP_LPiState::packcstat, SCIP_LPiState::packrstat, and SCIPencodeDualBit().

Referenced by SCIPlpiGetState().

◆ lpistateUnpack()

void lpistateUnpack	(	const SCIP_LPISTATE *	lpistate,
		int *	cstat,
		int *	rstat )

static

unpacks row and column basis status from a packed LPi state object

Parameters

lpistate	pointer to LPi state data
cstat	buffer for storing basis status of columns in unpacked format
rstat	buffer for storing basis status of rows in unpacked format (row status w.r.t. slack columns)

Definition at line 357 of file lpi_xprs.c.

References assert(), SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, SCIP_LPiState::packcstat, SCIP_LPiState::packrstat, and SCIPdecodeDualBit().

Referenced by SCIPlpiSetState().

◆ lpistateCreate()

SCIP_RETCODE lpistateCreate	(	SCIP_LPISTATE **	lpistate,
		BMS_BLKMEM *	blkmem,
		int	ncols,
		int	nrows )

static

creates LPi state information object

Parameters

lpistate	pointer to LPi state
blkmem	block memory
ncols	number of columns to store
nrows	number of rows to store

Definition at line 373 of file lpi_xprs.c.

References assert(), BMSallocBlockMemory, BMSallocBlockMemoryArray, colpacketNum(), NULL, rowpacketNum(), SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpiGetState().

◆ lpistateFree()

void lpistateFree	(	SCIP_LPISTATE **	lpistate,
		BMS_BLKMEM *	blkmem )

static

frees LPi state information

Parameters

lpistate	pointer to LPi state information (like basis information)
blkmem	block memory

Definition at line 394 of file lpi_xprs.c.

References assert(), BMSfreeBlockMemory, BMSfreeBlockMemoryArray, colpacketNum(), NULL, and rowpacketNum().

Referenced by SCIPlpiFreeState().

◆ xprsObjsen()

int xprsObjsen ( SCIP_OBJSEN const objsen )

static

converts SCIP's objective sense into CPLEX's objective sense

Parameters

objsen objective sense

Definition at line 418 of file lpi_xprs.c.

References SCIP_OBJSEN_MAXIMIZE, SCIP_OBJSEN_MINIMIZE, SCIPABORT, and SCIPerrorMessage.

Referenced by SCIPlpiChgObjsen().

◆ convertSides()

void convertSides	(	SCIP_LPI *	lpi,
		int	nrows,
		const SCIP_Real *	lhss,
		const SCIP_Real *	rhss )

static

converts SCIP's lhs/rhs pairs into Xpress' sen/rhs/rng

Parameters

lpi	LP interface structure
nrows	number of rows
lhss	left hand side vector
rhss	right hand side vector

Definition at line 437 of file lpi_xprs.c.

References assert(), i, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_Real, and SCIP_LPi::senarray.

Referenced by SCIPlpiAddRows(), SCIPlpiChgSides(), and SCIPlpiLoadColLP().

◆ reconvertBothSides()

void reconvertBothSides	(	SCIP_LPI *	lpi,
		int	nrows,
		SCIP_Real *	lhss,
		SCIP_Real *	rhss )

static

converts Xpress' sen/rhs/rng triplets into SCIP's lhs/rhs pairs

Parameters

lpi	LP interface structure
nrows	number of rows
lhss	buffer to store the left hand side vector
rhss	buffer to store the right hand side vector

Definition at line 486 of file lpi_xprs.c.

References assert(), i, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_Real, SCIPABORT, SCIPerrorMessage, and SCIP_LPi::senarray.

Referenced by reconvertSides().

◆ reconvertLhs()

void reconvertLhs	(	SCIP_LPI *	lpi,
		int	nrows,
		SCIP_Real *	lhss )

static

converts Xpress' sen/rhs/rng triplets into SCIP's lhs/rhs pairs, only storing the left hand side

Parameters

lpi	LP interface structure
nrows	number of rows
lhss	buffer to store the left hand side vector

Definition at line 535 of file lpi_xprs.c.

References assert(), i, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_Real, SCIPABORT, SCIPerrorMessage, and SCIP_LPi::senarray.

Referenced by reconvertSides().

◆ reconvertRhs()

void reconvertRhs	(	SCIP_LPI *	lpi,
		int	nrows,
		SCIP_Real *	rhss )

static

converts Xpress' sen/rhs/rng triplets into SCIP's lhs/rhs pairs, only storing the right hand side

Parameters

lpi	LP interface structure
nrows	number of rows
rhss	buffer to store the right hand side vector

Definition at line 580 of file lpi_xprs.c.

References assert(), i, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_Real, SCIPABORT, SCIPerrorMessage, and SCIP_LPi::senarray.

Referenced by reconvertSides().

◆ reconvertSides()

void reconvertSides	(	SCIP_LPI *	lpi,
		int	nrows,
		SCIP_Real *	lhs,
		SCIP_Real *	rhs )

static

converts Xpress' sen/rhs/rng triplets into SCIP's lhs/rhs pairs

Parameters

lpi	LP interface structure
nrows	number of rows
lhs	buffer to store the left hand side vector, or NULL
rhs	buffer to store the right hand side vector, or NULL

Definition at line 625 of file lpi_xprs.c.

References NULL, reconvertBothSides(), reconvertLhs(), reconvertRhs(), and SCIP_Real.

Referenced by SCIPlpiGetSides().

◆ invalidateSolution()

void invalidateSolution ( SCIP_LPI * lpi )

static

marks the current LP to be unsolved

Definition at line 645 of file lpi_xprs.c.

References assert(), NULL, and SCIP_LPi::solstat.

Referenced by lpiSolve(), SCIPlpiAddCols(), SCIPlpiAddRows(), SCIPlpiChgBounds(), SCIPlpiChgCoef(), SCIPlpiChgObj(), SCIPlpiChgObjsen(), SCIPlpiChgSides(), SCIPlpiClear(), SCIPlpiCreate(), SCIPlpiDelCols(), SCIPlpiDelColset(), SCIPlpiDelRows(), SCIPlpiDelRowset(), SCIPlpiLoadColLP(), SCIPlpiScaleCol(), SCIPlpiScaleRow(), and SCIPlpiSetBase().

◆ lpiSolve()

SCIP_RETCODE lpiSolve	(	SCIP_LPI *	lpi,
		const char *	method )

static

solve LP

Parameters

lpi	LP interface structure
method	indicates the method to use ('p' - primal, 'd' - dual, 'b' - barrier)

Definition at line 1848 of file lpi_xprs.c.

References assert(), CHECK_ZERO, SCIP_LPi::clearstate, FALSE, invalidateSolution(), SCIP_LPi::iterations, SCIP_LPi::messagehdlr, NULL, SCIP_LPi::par_fastlp, SCIP_LPi::par_presolve, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::solisbasic, SCIP_LPi::solstat, TRUE, XPRS_LP_OPTIMAL_SCALEDINFEAS, XPRS_LPQUICKPRESOLVE, and SCIP_LPi::xprslp.

Referenced by SCIPlpiSolveBarrier(), SCIPlpiSolveDual(), and SCIPlpiSolvePrimal().

◆ lpiStrongbranch()

SCIP_RETCODE lpiStrongbranch	(	SCIP_LPI *	lpi,
		int	col,
		SCIP_Real	psol,
		int	itlim,
		SCIP_Real *	down,
		SCIP_Real *	up,
		SCIP_Bool *	downvalid,
		SCIP_Bool *	upvalid,
		int *	iter )

static

performs strong branching iterations on one candidate

Parameters

lpi	LP interface structure
col	column to apply strong branching on
psol	current primal solution value of column
itlim	iteration limit for strong branchings
down	stores dual bound after branching column down
up	stores dual bound after branching column up
downvalid	stores whether the returned down value is a valid dual bound; otherwise, it can only be used as an estimate value
upvalid	stores whether the returned up value is a valid dual bound; otherwise, it can only be used as an estimate value
iter	stores total number of strong branching iterations, or -1; may be NULL

Definition at line 2031 of file lpi_xprs.c.

References assert(), CHECK_ZERO, EPSCEIL, EPSFLOOR, FALSE, SCIP_LPi::messagehdlr, NULL, SCIP_Bool, SCIP_CALL, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetObjsen(), TRUE, and SCIP_LPi::xprslp.

Referenced by SCIPlpiStrongbranchFrac(), and SCIPlpiStrongbranchInt().

◆ lpiStrongbranches()

SCIP_RETCODE lpiStrongbranches	(	SCIP_LPI *	lpi,
		int *	cols,
		int	ncols,
		SCIP_Real *	psols,
		int	itlim,
		SCIP_Real *	down,
		SCIP_Real *	up,
		SCIP_Bool *	downvalid,
		SCIP_Bool *	upvalid,
		int *	iter )

static

performs strong branching iterations on given candidates

Parameters

lpi	LP interface structure
cols	columns to apply strong branching on
ncols	number of columns
psols	current primal solution values of columns (might be integral)
itlim	iteration limit for strong branchings
down	stores dual bounds after branching columns down
up	stores dual bounds after branching columns up
downvalid	stores whether the returned down values are valid dual bounds; otherwise, they can only be used as an estimate values
upvalid	stores whether the returned up values are a valid dual bounds; otherwise, they can only be used as an estimate values
iter	stores total number of strong branching iterations, or -1; may be NULL

Definition at line 2115 of file lpi_xprs.c.

References assert(), BMSallocMemoryArray, BMSfreeMemoryArray, CHECK_ZERO, EPSCEIL, EPSFLOOR, FALSE, SCIP_LPi::messagehdlr, NULL, SCIP_ALLOC, SCIP_Bool, SCIP_CALL, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetObjsen(), TRUE, and SCIP_LPi::xprslp.

Referenced by SCIPlpiStrongbranchesFrac(), and SCIPlpiStrongbranchesInt().

Variable Documentation

◆ xprsname

_Thread_local char xprsname[100]

static

Definition at line 663 of file lpi_xprs.c.

Referenced by SCIPlpiGetSolverName().

Detailed Description

Data Structures

Macros

Functions

Miscellaneous Methods

Macro Definition Documentation

◆ XPRS_LPQUICKPRESOLVE

◆ XPRS_LP_OPTIMAL_SCALEDINFEAS

◆ CHECK_ZERO

◆ ABORT_ZERO

◆ COLS_PER_PACKET

◆ ROWS_PER_PACKET

Function Documentation

◆ debugCheckColrang()

◆ debugCheckRowrang()

◆ ensureBoundchgMem()

◆ ensureSidechgMem()

◆ ensureValMem()

◆ ensureCstatMem()

◆ ensureRstatMem()

◆ colpacketNum()

◆ rowpacketNum()

◆ lpistatePack()

◆ lpistateUnpack()

◆ lpistateCreate()

◆ lpistateFree()

◆ xprsObjsen()

◆ convertSides()

◆ reconvertBothSides()

◆ reconvertLhs()

◆ reconvertRhs()

◆ reconvertSides()

◆ invalidateSolution()

◆ lpiSolve()

◆ lpiStrongbranch()

◆ lpiStrongbranches()

Variable Documentation

◆ xprsname