lpi_qso.c File Reference

Detailed Description

LP interface for QSopt version >= 070303.

Author

Daniel Espinoza

Marc Pfetsch

Definition in file lpi_qso.c.

#include "qsopt.h"
#include "scip/bitencode.h"
#include "lpi/lpi.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include <string.h>

Go to the source code of this file.

Data Structures
struct	SCIP_LPi
struct	SCIP_LPiNorms
struct	SCIP_LPiState

Macros
#define	COLS_PER_PACKET   SCIP_DUALPACKETSIZE
#define	ROWS_PER_PACKET   SCIP_DUALPACKETSIZE
#define	FEASTOL   1e-6
#define	EPSILON   1e-9
#define	QS_TESTG(A, B, C)
#define	QS_ERROR(A, ...)
#define	QS_RETURN(A)
#define	QS_CONDRET(A)

Typedefs
typedef SCIP_DUALPACKET	COLPACKET
typedef SCIP_DUALPACKET	ROWPACKET
typedef enum LPI_QSOPT_Algo	LPI_QSOPT_ALGO

Enumerations
enum	LPI_QSOPT_Algo {   LPI_QSOPT_ALGO_UNKNOWN = 0 ,   LPI_QSOPT_ALGO_PRIMAL = 1 ,   LPI_QSOPT_ALGO_DUAL = 2 }

Functions
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)
static SCIP_RETCODE	ensureTabMem (SCIP_LPI *const lpi, int sz)
static SCIP_RETCODE	ensureColMem (SCIP_LPI *const lpi, int ncols)
static SCIP_RETCODE	ensureRowMem (SCIP_LPI *const lpi, int nrows)
static SCIP_RETCODE	convertSides (SCIP_LPI *const lpi, int nrows, const double *const lhs, const double *const rhs)
Miscellaneous Methods
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)
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	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	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	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
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)
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)

Macro Definition Documentation

COLS_PER_PACKET

#define COLS_PER_PACKET   SCIP_DUALPACKETSIZE

Definition at line 42 of file lpi_qso.c.

ROWS_PER_PACKET

#define ROWS_PER_PACKET   SCIP_DUALPACKETSIZE

Definition at line 44 of file lpi_qso.c.

FEASTOL

#define FEASTOL   1e-6

(feasibility) tolerance for qsopt

Definition at line 99 of file lpi_qso.c.

EPSILON

#define EPSILON   1e-9

tolerance for testing equality

Definition at line 102 of file lpi_qso.c.

QS_TESTG

#define QS_TESTG	(		A,
			B,
			C
	)

Value:

         do{{                    \
         if (A){                                \
            fprintf(stderr, C);                 \
            __QS_PRINTLOC__;                    \
            goto B;}}}while(0)

This macro is to print error messages and jump to the given point in the code, it also prints the file name and line where this happened.

Definition at line 109 of file lpi_qso.c.

QS_ERROR

#define QS_ERROR	(		A,
			...
	)

Value:

         do{{                    \
         if (A){                                \
            fprintf(stderr,__VA_ARGS__);        \
            __QS_PRINTLOC__;                    \
            return SCIP_LPERROR;}}}while(0)

This macro is to print error messages and to exit with SCIP_LPERROR.

Definition at line 116 of file lpi_qso.c.

QS_RETURN

#define QS_RETURN

(

A

)

Value:

      do{                                                \
      const int __RVAL__ = (A);                                         \
      if (__RVAL__){                                                    \
         fprintf(stderr,"LP Error: QSopt returned %d",__RVAL__);        \
         __QS_PRINTLOC__;                                               \
         return SCIP_ERROR;}                                            \
      return SCIP_OKAY;}while(0)

Return value macro, if the value is non-zero, write to standard error the returning code and where this happened, and return SCIP_ERROR, otherwise return normal SCIP_OKAY termination code.

Definition at line 124 of file lpi_qso.c.

QS_CONDRET

#define QS_CONDRET

(

A

)

Value:

      do{                                               \
      const int __RVAL__ = (A);                                         \
      if (__RVAL__){                                                    \
         fprintf(stderr,"LP Error: QSopt returned %d",__RVAL__);        \
         __QS_PRINTLOC__;                                               \
         return SCIP_LPERROR;}                                          \
   }while(0)

Return value macro, if the value is non-zero, write to standard error the returning code and where this happened, and return SCIP_ERROR, otherwise do nothing.

Definition at line 134 of file lpi_qso.c.

Typedef Documentation

COLPACKET

typedef SCIP_DUALPACKET COLPACKET

Definition at line 41 of file lpi_qso.c.

ROWPACKET

typedef SCIP_DUALPACKET ROWPACKET

Definition at line 43 of file lpi_qso.c.

LPI_QSOPT_ALGO

typedef enum LPI_QSOPT_Algo LPI_QSOPT_ALGO

Definition at line 52 of file lpi_qso.c.

Enumeration Type Documentation

LPI_QSOPT_Algo

enum LPI_QSOPT_Algo

Enumerator
LPI_QSOPT_ALGO_UNKNOWN	unknown
LPI_QSOPT_ALGO_PRIMAL	primal simplex
LPI_QSOPT_ALGO_DUAL	dual simplex

Definition at line 46 of file lpi_qso.c.

Function Documentation

colpacketNum()

static 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 160 of file lpi_qso.c.

References COLS_PER_PACKET.

Referenced by lpistateCreate(), and lpistateFree().

rowpacketNum()

static 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 169 of file lpi_qso.c.

References ROWS_PER_PACKET.

Referenced by lpistateCreate(), and lpistateFree().

lpistatePack()

static 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

Definition at line 178 of file lpi_qso.c.

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

Referenced by SCIPlpiGetState().

lpistateUnpack()

static 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

Definition at line 194 of file lpi_qso.c.

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

Referenced by SCIPlpiSetState().

lpistateCreate()

static 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 210 of file lpi_qso.c.

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

Referenced by SCIPlpiGetState().

lpistateFree()

static 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 231 of file lpi_qso.c.

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

Referenced by SCIPlpiFreeState().

ensureTabMem()

static SCIP_RETCODE ensureTabMem ( SCIP_LPI *const  lpi, int  sz  )

static

ensure size of column-related arrays

Parameters

lpi	pointer to an LP interface structure
sz	size

Definition at line 253 of file lpi_qso.c.

References BMSreallocMemoryArray, SCIP_LPi::ibas, SCIP_LPi::itab, NULL, SCIP_ALLOC, SCIP_OKAY, and SCIP_LPi::tbsz.

Referenced by SCIPlpiGetBase(), SCIPlpiGetBInvARow(), SCIPlpiGetSol(), SCIPlpiSetBase(), and SCIPlpiSetState().

ensureColMem()

static SCIP_RETCODE ensureColMem ( SCIP_LPI *const  lpi, int  ncols  )

static

ensure size of column-related arrays

Parameters

lpi	pointer to an LP interface structure
ncols	number of columns

Definition at line 270 of file lpi_qso.c.

References BMSreallocMemoryArray, SCIP_LPi::colspace, SCIP_LPi::iccha, SCIP_LPi::iccnt, NULL, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpiAddCols(), SCIPlpiChgBounds(), SCIPlpiDelCols(), SCIPlpiGetBounds(), SCIPlpiGetCols(), SCIPlpiGetObj(), SCIPlpiGetState(), SCIPlpiLoadColLP(), and SCIPlpiSetState().

ensureRowMem()

static SCIP_RETCODE ensureRowMem ( SCIP_LPI *const  lpi, int  nrows  )

static

ensure size of row-related arrays

Parameters

lpi	pointer to an LP interface structure
nrows	number of rows

Definition at line 287 of file lpi_qso.c.

References BMSreallocMemoryArray, SCIP_LPi::irbeg, SCIP_LPi::ircnt, SCIP_LPi::irhs, SCIP_LPi::irng, SCIP_LPi::isen, NULL, SCIP_LPi::rowspace, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpiAddRows(), SCIPlpiChgSides(), SCIPlpiDelRows(), SCIPlpiGetBase(), SCIPlpiGetRows(), SCIPlpiGetSides(), SCIPlpiGetSol(), SCIPlpiGetState(), SCIPlpiLoadColLP(), SCIPlpiSetBase(), and SCIPlpiSetState().

convertSides()

static SCIP_RETCODE convertSides ( SCIP_LPI *const  lpi, int  nrows, const double *const  lhs, const double *const  rhs  )

static

transform lhs/rhs into qsopt format

Parameters

lpi	pointer to an LP interface structure
nrows	number of rows
lhs	left hand side
rhs	right hand side

Definition at line 307 of file lpi_qso.c.

References EPSEQ, EPSILON, SCIP_LPi::irbeg, SCIP_LPi::ircnt, SCIP_LPi::irhs, SCIP_LPi::irng, SCIP_LPi::isen, NULL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPABORT, and SCIPerrorMessage.

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