SCIP
Solving Constraint Integer Programs
Solving Constraint Integer Programs
LP interface for SoPlex version 2.0 and higher.
This is an implementation of SCIP's LP interface for SoPlex using the extended and improved interface of SoPlex 2.0
For debugging purposes, the SoPlex results can be double checked with CPLEX if WITH_LPSCHECK is defined. This may yield false positives, since the LP is dumped to a file for transfering it to CPLEX, hence, precision may be lost.
Definition in file lpi_spx2.cpp.
#include "soplex.h"#include "spxgithash.h"#include "scip/pub_message.h"#include <cassert>#include "lpi/lpi.h"#include "scip/bitencode.h"Go to the source code of this file.
Macros | |
| #define | STRONGBRANCH_RESTOREBASIS |
| #define | CHECK_SOPLEX_PARAM(x) |
| #define | SOPLEX_SUBVERSION 0 |
| #define | SOPLEX_VERBLEVEL 5 |
| #define | NULL 0 |
| #define | SOPLEX_TRY(messagehdlr, x) |
| #define | SOPLEX_TRY_ABORT(x) |
| #define | COLS_PER_PACKET SCIP_DUALPACKETSIZE |
| #define | ROWS_PER_PACKET SCIP_DUALPACKETSIZE |
Typedefs | |
| typedef SCIP_DUALPACKET | COLPACKET |
| typedef SCIP_DUALPACKET | ROWPACKET |
Variables | |
| static char | spxname [100] |
| static char | spxdesc [200] |
| #define STRONGBRANCH_RESTOREBASIS |
if defined then in SCIPlpiStrongbranch() we restore the basis after the down branch and after the up branch; if false only after the end of a strong branching phase, which however seems to mostly increase strong branching time and iterations
Definition at line 30 of file lpi_spx2.cpp.
| #define CHECK_SOPLEX_PARAM | ( | x | ) |
Definition at line 68 of file lpi_spx2.cpp.
| #define SOPLEX_SUBVERSION 0 |
Definition at line 85 of file lpi_spx2.cpp.
Referenced by SCIPlpiGetNNonz(), and SCIPlpiGetSolverName().
| #define SOPLEX_VERBLEVEL 5 |
verbosity level for LPINFO
Definition at line 109 of file lpi_spx2.cpp.
Referenced by lpiStrongbranch(), SCIPlpiCreate(), and spxSolve().
| #define NULL 0 |
Definition at line 119 of file lpi_spx2.cpp.
Referenced by ensureCstatMem(), ensureRstatMem(), fileExists(), lpistateCreate(), lpistateFree(), lpistatePack(), lpistateUnpack(), lpiStrongbranch(), SCIPlpiAddCols(), SCIPlpiAddRows(), SCIPlpiChgBounds(), SCIPlpiChgCoef(), SCIPlpiChgObj(), SCIPlpiChgObjsen(), SCIPlpiChgSides(), SCIPlpiClear(), SCIPlpiClearState(), SCIPlpiCreate(), SCIPlpiDelCols(), SCIPlpiDelColset(), SCIPlpiDelRows(), SCIPlpiDelRowset(), SCIPlpiExistsDualRay(), SCIPlpiExistsPrimalRay(), SCIPlpiFree(), SCIPlpiFreeNorms(), SCIPlpiFreeState(), SCIPlpiGetBase(), SCIPlpiGetBasisInd(), SCIPlpiGetBInvACol(), SCIPlpiGetBInvARow(), SCIPlpiGetBInvCol(), SCIPlpiGetBInvRow(), SCIPlpiGetBounds(), SCIPlpiGetCoef(), SCIPlpiGetColNames(), SCIPlpiGetCols(), SCIPlpiGetDualfarkas(), SCIPlpiGetInternalStatus(), SCIPlpiGetIntpar(), SCIPlpiGetIterations(), SCIPlpiGetNCols(), SCIPlpiGetNNonz(), SCIPlpiGetNorms(), SCIPlpiGetNRows(), SCIPlpiGetObj(), SCIPlpiGetObjsen(), SCIPlpiGetObjval(), SCIPlpiGetPrimalRay(), SCIPlpiGetRealpar(), SCIPlpiGetRealSolQuality(), SCIPlpiGetRowNames(), SCIPlpiGetRows(), SCIPlpiGetSides(), SCIPlpiGetSol(), SCIPlpiGetSolFeasibility(), SCIPlpiGetState(), SCIPlpiHasDualRay(), SCIPlpiHasPrimalRay(), SCIPlpiIgnoreInstability(), SCIPlpiIsDualFeasible(), SCIPlpiIsDualInfeasible(), SCIPlpiIsDualUnbounded(), SCIPlpiIsIterlimExc(), SCIPlpiIsObjlimExc(), SCIPlpiIsOptimal(), SCIPlpiIsPrimalFeasible(), SCIPlpiIsPrimalInfeasible(), SCIPlpiIsPrimalUnbounded(), SCIPlpiIsStable(), SCIPlpiIsTimelimExc(), SCIPlpiLoadColLP(), SCIPlpiReadLP(), SCIPlpiScaleCol(), SCIPlpiScaleRow(), SCIPlpiSetBase(), SCIPlpiSetIntegralityInformation(), SCIPlpiSetIntpar(), SCIPlpiSetNorms(), SCIPlpiSetRealpar(), SCIPlpiSetState(), SCIPlpiSolveDual(), SCIPlpiSolvePrimal(), SCIPlpiStrongbranchesFrac(), SCIPlpiStrongbranchesInt(), SCIPlpiWasSolved(), SCIPlpiWriteLP(), and spxSolve().
| #define SOPLEX_TRY | ( | messagehdlr, | |
| x | |||
| ) |
Macro for a single SoPlex call for which exceptions have to be catched - return an LP error. We make no distinction between different exception types, e.g., between memory allocation and other exceptions.
Definition at line 130 of file lpi_spx2.cpp.
Referenced by SCIPlpiChgCoef(), SCIPlpiChgObjsen(), SCIPlpiClear(), SCIPlpiCreate(), SCIPlpiDelCols(), SCIPlpiDelColset(), SCIPlpiDelRows(), SCIPlpiDelRowset(), SCIPlpiReadState(), SCIPlpiSetBase(), and SCIPlpiWriteState().
| #define SOPLEX_TRY_ABORT | ( | x | ) |
Definition at line 175 of file lpi_spx2.cpp.
| #define COLS_PER_PACKET SCIP_DUALPACKETSIZE |
Definition at line 715 of file lpi_spx2.cpp.
Referenced by colpacketNum().
| #define ROWS_PER_PACKET SCIP_DUALPACKETSIZE |
Definition at line 717 of file lpi_spx2.cpp.
Referenced by rowpacketNum().
| typedef SCIP_DUALPACKET COLPACKET |
Definition at line 714 of file lpi_spx2.cpp.
| typedef SCIP_DUALPACKET ROWPACKET |
Definition at line 716 of file lpi_spx2.cpp.
|
static |
resizes cstat array to have at least num entries
| lpi | LP interface structure |
| num | minimal number of entries in array |
Definition at line 761 of file lpi_spx2.cpp.
References BMSreallocMemoryArray, SCIP_LPi::cstat, SCIP_LPi::cstatsize, ensureRstatMem(), MAX, NULL, SCIP_ALLOC, and SCIP_OKAY.
Referenced by SCIPlpiGetState(), and SCIPlpiSetState().
|
static |
resizes rstat array to have at least num entries
| lpi | LP interface structure |
| num | minimal number of entries in array |
Definition at line 783 of file lpi_spx2.cpp.
References BMSreallocMemoryArray, colpacketNum(), MAX, NULL, SCIP_LPi::rstat, SCIP_LPi::rstatsize, SCIP_ALLOC, and SCIP_OKAY.
Referenced by ensureCstatMem(), SCIPlpiGetState(), and SCIPlpiSetState().
|
static |
returns the number of packets needed to store column packet information
| ncols | number of columns to store |
Definition at line 812 of file lpi_spx2.cpp.
References COLS_PER_PACKET, and rowpacketNum().
Referenced by ensureRstatMem(), lpistateCreate(), and lpistateFree().
|
static |
returns the number of packets needed to store row packet information
| nrows | number of rows to store |
Definition at line 821 of file lpi_spx2.cpp.
References lpistatePack(), and ROWS_PER_PACKET.
Referenced by colpacketNum(), lpistateCreate(), and lpistateFree().
|
static |
store row and column basis status in a packed LPi state object
| 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 830 of file lpi_spx2.cpp.
References lpistateUnpack(), SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, SCIP_LPiState::packcstat, SCIP_LPiState::packrstat, and SCIPencodeDualBit().
Referenced by rowpacketNum(), and SCIPlpiGetState().
|
static |
unpacks row and column basis status from a packed LPi state object
| 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 846 of file lpi_spx2.cpp.
References lpistateCreate(), SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, SCIP_LPiState::packcstat, SCIP_LPiState::packrstat, and SCIPdecodeDualBit().
Referenced by lpistatePack(), and SCIPlpiSetState().
|
static |
creates LPi state information object
| lpistate | pointer to LPi state |
| blkmem | block memory |
| ncols | number of columns to store |
| nrows | number of rows to store |
Definition at line 862 of file lpi_spx2.cpp.
References BMSallocBlockMemory, BMSallocBlockMemoryArray, colpacketNum(), lpistateFree(), NULL, rowpacketNum(), SCIP_ALLOC, and SCIP_OKAY.
Referenced by lpistateUnpack(), and SCIPlpiGetState().
|
static |
frees LPi state information
| lpistate | pointer to LPi state information (like basis information) |
| blkmem | block memory |
Definition at line 886 of file lpi_spx2.cpp.
References BMSfreeBlockMemory, BMSfreeBlockMemoryArray, colpacketNum(), invalidateSolution(), NULL, and rowpacketNum().
Referenced by lpistateCreate(), and SCIPlpiFreeState().
|
static |
marks the current LP to be unsolved
Definition at line 913 of file lpi_spx2.cpp.
Referenced by lpistateFree(), SCIPlpiAddCols(), SCIPlpiAddRows(), SCIPlpiChgBounds(), SCIPlpiChgCoef(), SCIPlpiChgObj(), SCIPlpiChgObjsen(), SCIPlpiChgSides(), SCIPlpiClear(), SCIPlpiCreate(), SCIPlpiDelCols(), SCIPlpiDelColset(), SCIPlpiDelRows(), SCIPlpiDelRowset(), SCIPlpiLoadColLP(), SCIPlpiScaleCol(), SCIPlpiScaleRow(), SCIPlpiSetBase(), and spxSolve().
| const char* SCIPlpiGetSolverName | ( | void | ) |
gets name and version of LP solver
Definition at line 937 of file lpi_spx2.cpp.
References SCIPdebugMessage, SCIPlpiGetSolverDesc(), SOPLEX_SUBVERSION, and spxname.
| const char* SCIPlpiGetSolverDesc | ( | void | ) |
gets description of LP solver (developer, webpage, ...)
Definition at line 952 of file lpi_spx2.cpp.
References SCIPlpiGetSolverPointer(), and spxdesc.
Referenced by SCIPlpiGetSolverName().
| void* SCIPlpiGetSolverPointer | ( | SCIP_LPI * | lpi | ) |
gets pointer for LP solver - use only with great care
| lpi | pointer to an LP interface structure |
Definition at line 966 of file lpi_spx2.cpp.
References SCIPlpiSetIntegralityInformation(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetSolverDesc().
| SCIP_RETCODE SCIPlpiSetIntegralityInformation | ( | SCIP_LPI * | lpi, |
| int | ncols, | ||
| int * | intInfo | ||
| ) |
pass integrality information about variables to the solver
| lpi | pointer to an LP interface structure |
| ncols | length of integrality array |
| intInfo | integrality array (0: continuous, 1: integer) |
Definition at line 974 of file lpi_spx2.cpp.
References NULL, SCIP_LPERROR, SCIP_OKAY, SCIPerrorMessage, SCIPlpiCreate(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetSolverPointer().
| SCIP_RETCODE SCIPlpiCreate | ( | SCIP_LPI ** | lpi, |
| SCIP_MESSAGEHDLR * | messagehdlr, | ||
| const char * | name, | ||
| SCIP_OBJSEN | objsen | ||
| ) |
creates an LP problem object
| lpi | pointer to an LP interface structure |
| messagehdlr | message handler to use for printing messages, or NULL |
| name | problem name |
| objsen | objective sense |
Definition at line 1003 of file lpi_spx2.cpp.
References BMSallocMemory, BMSallocMemoryCPP, FALSE, invalidateSolution(), NULL, SCIP_ALLOC, SCIP_CALL, SCIP_LPPAR_PRICING, SCIP_OKAY, SCIP_PRICING_LPIDEFAULT, SCIPlpiChgObjsen(), SCIPlpiFree(), SCIPlpiSetIntpar(), SOPLEX_TRY, and SOPLEX_VERBLEVEL.
Referenced by SCIPlpiSetIntegralityInformation().
| SCIP_RETCODE SCIPlpiFree | ( | SCIP_LPI ** | lpi | ) |
deletes an LP problem object
| lpi | pointer to an LP interface structure |
Definition at line 1050 of file lpi_spx2.cpp.
References BMSfreeMemory, BMSfreeMemoryArrayNull, NULL, SCIP_OKAY, and SCIPlpiLoadColLP().
Referenced by SCIPlpiCreate().
| 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 ** | , | ||
| int | nnonz, | ||
| const int * | beg, | ||
| const int * | ind, | ||
| const SCIP_Real * | val | ||
| ) |
copies LP data with column matrix into LP solver
| lpi | LP interface structure |
| objsen | objective sense |
| ncols | number of columns |
| obj | objective function values of columns |
| lb | lower bounds of columns |
| ub | upper bounds of columns |
| colnames | column names, or NULL |
| nrows | number of rows |
| lhs | left hand sides of rows |
| rhs | right hand sides of rows |
| nnonz | number of nonzero elements in the constraint matrix |
| beg | start index of each column in ind- and val-array |
| ind | row indices of constraint matrix entries |
| val | values of constraint matrix entries |
Definition at line 1083 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_CALL, SCIP_LPERROR, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIPdebugMessage, SCIPlpiAddCols(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiFree().
| SCIP_RETCODE SCIPlpiAddCols | ( | SCIP_LPI * | lpi, |
| int | ncols, | ||
| const SCIP_Real * | obj, | ||
| const SCIP_Real * | lb, | ||
| const SCIP_Real * | ub, | ||
| char ** | , | ||
| int | nnonz, | ||
| const int * | beg, | ||
| const int * | ind, | ||
| const SCIP_Real * | val | ||
| ) |
adds columns to the LP
| lpi | LP interface structure |
| ncols | number of columns to be added |
| obj | objective function values of new columns |
| lb | lower bounds of new columns |
| ub | upper bounds of new columns |
| nnonz | number of nonzero elements to be added to the constraint matrix |
| beg | start index of each column in ind- and val-array, or NULL if nnonz == 0 |
| ind | row indices of constraint matrix entries, or NULL if nnonz == 0 |
| val | values of constraint matrix entries, or NULL if nnonz == 0 |
Definition at line 1147 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiDelCols(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiLoadColLP().
| SCIP_RETCODE SCIPlpiDelCols | ( | SCIP_LPI * | lpi, |
| int | firstcol, | ||
| int | lastcol | ||
| ) |
deletes all columns in the given range from LP
| lpi | LP interface structure |
| firstcol | first column to be deleted |
| lastcol | last column to be deleted |
Definition at line 1226 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiDelColset(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiAddCols().
| SCIP_RETCODE SCIPlpiDelColset | ( | SCIP_LPI * | lpi, |
| int * | dstat | ||
| ) |
deletes columns from SCIP_LP; the new position of a column must not be greater that its old position
| lpi | LP interface structure |
| dstat | deletion status of columns input: 1 if column should be deleted, 0 if not output: new position of column, -1 if column was deleted |
Definition at line 1248 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiAddRows(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiDelCols().
| SCIP_RETCODE SCIPlpiAddRows | ( | SCIP_LPI * | lpi, |
| int | nrows, | ||
| const SCIP_Real * | lhs, | ||
| const SCIP_Real * | rhs, | ||
| char ** | , | ||
| int | nnonz, | ||
| const int * | beg, | ||
| const int * | ind, | ||
| const SCIP_Real * | val | ||
| ) |
adds rows to the LP
| lpi | LP interface structure |
| nrows | number of rows to be added |
| lhs | left hand sides of new rows |
| rhs | right hand sides of new rows |
| nnonz | number of nonzero elements to be added to the constraint matrix |
| beg | start index of each row in ind- and val-array, or NULL if nnonz == 0 |
| ind | column indices of constraint matrix entries, or NULL if nnonz == 0 |
| val | values of constraint matrix entries, or NULL if nnonz == 0 |
Definition at line 1279 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiDelRows(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiDelColset().
| SCIP_RETCODE SCIPlpiDelRows | ( | SCIP_LPI * | lpi, |
| int | firstrow, | ||
| int | lastrow | ||
| ) |
deletes all rows in the given range from LP
| lpi | LP interface structure |
| firstrow | first row to be deleted |
| lastrow | last row to be deleted |
Definition at line 1354 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiDelRowset(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiAddRows().
| SCIP_RETCODE SCIPlpiDelRowset | ( | SCIP_LPI * | lpi, |
| int * | dstat | ||
| ) |
deletes rows from SCIP_LP; the new position of a row must not be greater that its old position
| lpi | LP interface structure |
| dstat | deletion status of rows input: 1 if row should be deleted, 0 if not output: new position of row, -1 if row was deleted |
Definition at line 1376 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiClear(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiDelRows().
| SCIP_RETCODE SCIPlpiClear | ( | SCIP_LPI * | lpi | ) |
clears the whole LP
| lpi | LP interface structure |
Definition at line 1407 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiChgBounds(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiDelRowset().
| SCIP_RETCODE SCIPlpiChgBounds | ( | SCIP_LPI * | lpi, |
| int | ncols, | ||
| const int * | ind, | ||
| const SCIP_Real * | lb, | ||
| const SCIP_Real * | ub | ||
| ) |
changes lower and upper bounds of columns
| lpi | LP interface structure |
| ncols | number of columns to change bounds for |
| ind | column indices |
| lb | values for the new lower bounds |
| ub | values for the new upper bounds |
Definition at line 1425 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPerrorMessage, SCIPlpiChgSides(), SCIPlpiIsInfinity(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiClear().
| SCIP_RETCODE SCIPlpiChgSides | ( | SCIP_LPI * | lpi, |
| int | nrows, | ||
| const int * | ind, | ||
| const SCIP_Real * | lhs, | ||
| const SCIP_Real * | rhs | ||
| ) |
changes left and right hand sides of rows
| lpi | LP interface structure |
| nrows | number of rows to change sides for |
| ind | row indices |
| lhs | new values for left hand sides |
| rhs | new values for right hand sides |
Definition at line 1484 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiChgCoef(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiChgBounds().
| SCIP_RETCODE SCIPlpiChgCoef | ( | SCIP_LPI * | lpi, |
| int | row, | ||
| int | col, | ||
| SCIP_Real | newval | ||
| ) |
changes a single coefficient
| lpi | LP interface structure |
| row | row number of coefficient to change |
| col | column number of coefficient to change |
| newval | new value of coefficient |
Definition at line 1531 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiChgObjsen(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiChgSides().
| SCIP_RETCODE SCIPlpiChgObjsen | ( | SCIP_LPI * | lpi, |
| SCIP_OBJSEN | objsen | ||
| ) |
changes the objective sense
| lpi | LP interface structure |
| objsen | new objective sense |
Definition at line 1555 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIPdebugMessage, SCIPlpiChgObj(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiChgCoef(), and SCIPlpiCreate().
| SCIP_RETCODE SCIPlpiChgObj | ( | SCIP_LPI * | lpi, |
| int | ncols, | ||
| const int * | ind, | ||
| const SCIP_Real * | obj | ||
| ) |
changes objective values of columns in the LP
| lpi | LP interface structure |
| ncols | number of columns to change objective value for |
| ind | column indices to change objective value for |
| obj | new objective values for columns |
Definition at line 1575 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiScaleRow(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiChgObjsen().
| SCIP_RETCODE SCIPlpiScaleRow | ( | SCIP_LPI * | lpi, |
| int | row, | ||
| SCIP_Real | scaleval | ||
| ) |
multiplies a row with a non-zero scalar; for negative scalars, the row's sense is switched accordingly
| lpi | LP interface structure |
| row | row number to scale |
| scaleval | scaling multiplier |
Definition at line 1619 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiScaleCol(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiChgObj().
| SCIP_RETCODE SCIPlpiScaleCol | ( | SCIP_LPI * | lpi, |
| int | col, | ||
| SCIP_Real | scaleval | ||
| ) |
multiplies a column with a non-zero scalar; the objective value is multiplied with the scalar, and the bounds are divided by the scalar; for negative scalars, the column's bounds are switched
| lpi | LP interface structure |
| col | column number to scale |
| scaleval | scaling multiplier |
Definition at line 1693 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetNRows(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiScaleRow().
| SCIP_RETCODE SCIPlpiGetNRows | ( | SCIP_LPI * | lpi, |
| int * | nrows | ||
| ) |
gets the number of rows in the LP
| lpi | LP interface structure |
| nrows | pointer to store the number of rows |
Definition at line 1782 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetNCols(), and SCIP_LPi::spx.
Referenced by SCIPlpiScaleCol().
| SCIP_RETCODE SCIPlpiGetNCols | ( | SCIP_LPI * | lpi, |
| int * | ncols | ||
| ) |
gets the number of columns in the LP
| lpi | LP interface structure |
| ncols | pointer to store the number of cols |
Definition at line 1799 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetNNonz(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetNRows().
| SCIP_RETCODE SCIPlpiGetNNonz | ( | SCIP_LPI * | lpi, |
| int * | nnonz | ||
| ) |
gets the number of nonzero elements in the LP constraint matrix
| lpi | LP interface structure |
| nnonz | pointer to store the number of nonzeros |
Definition at line 1816 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetCols(), SOPLEX_SUBVERSION, and SCIP_LPi::spx.
Referenced by SCIPlpiGetNCols().
| 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 | ||
| ) |
gets columns from LP problem object; the arrays have to be large enough to store all values Either both, lb and ub, have to be NULL, or both have to be non-NULL, either nnonz, beg, ind, and val have to be NULL, or all of them have to be non-NULL.
| lpi | LP interface structure |
| firstcol | first column to get from LP |
| lastcol | last column to get from LP |
| lb | buffer to store the lower bound vector, or NULL |
| ub | buffer to store the upper bound vector, or NULL |
| nnonz | pointer to store the number of nonzero elements returned, or NULL |
| beg | buffer to store start index of each column in ind- and val-array, or NULL |
| ind | buffer to store column indices of constraint matrix entries, or NULL |
| val | buffer to store values of constraint matrix entries, or NULL |
Definition at line 1857 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetRows(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetNNonz().
| 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 | ||
| ) |
gets rows from LP problem object; the arrays have to be large enough to store all values. Either both, lhs and rhs, have to be NULL, or both have to be non-NULL, either nnonz, beg, ind, and val have to be NULL, or all of them have to be non-NULL.
| lpi | LP interface structure |
| firstrow | first row to get from LP |
| lastrow | last row to get from LP |
| lhs | buffer to store left hand side vector, or NULL |
| rhs | buffer to store right hand side vector, or NULL |
| nnonz | pointer to store the number of nonzero elements returned, or NULL |
| beg | buffer to store start index of each row in ind- and val-array, or NULL |
| ind | buffer to store row indices of constraint matrix entries, or NULL |
| val | buffer to store values of constraint matrix entries, or NULL |
Definition at line 1973 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetColNames(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetCols().
| SCIP_RETCODE SCIPlpiGetColNames | ( | SCIP_LPI * | lpi, |
| int | firstcol, | ||
| int | lastcol, | ||
| char ** | colnames, | ||
| char * | namestorage, | ||
| int | namestoragesize, | ||
| int * | storageleft | ||
| ) |
gets column names
| lpi | LP interface structure |
| firstcol | first column to get name from LP |
| lastcol | last column to get name from LP |
| colnames | pointers to column names (of size at least lastcol-firstcol+1) |
| namestorage | storage for col names |
| namestoragesize | size of namestorage (if 0, storageleft returns the storage needed) |
| storageleft | amount of storage left (if < 0 the namestorage was not big enough) |
Definition at line 2085 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetRowNames(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetRows().
| SCIP_RETCODE SCIPlpiGetRowNames | ( | SCIP_LPI * | lpi, |
| int | firstrow, | ||
| int | lastrow, | ||
| char ** | rownames, | ||
| char * | namestorage, | ||
| int | namestoragesize, | ||
| int * | storageleft | ||
| ) |
gets row names
| lpi | LP interface structure |
| firstrow | first row to get name from LP |
| lastrow | last row to get name from LP |
| rownames | pointers to row names (of size at least lastrow-firstrow+1) |
| namestorage | storage for row names |
| namestoragesize | size of namestorage (if 0, -storageleft returns the storage needed) |
| storageleft | amount of storage left (if < 0 the namestorage was not big enough) |
Definition at line 2111 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetObjsen(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetColNames().
| SCIP_RETCODE SCIPlpiGetObjsen | ( | SCIP_LPI * | lpi, |
| SCIP_OBJSEN * | objsen | ||
| ) |
gets objective sense of the LP
| lpi | LP interface structure |
| objsen | pointer to store objective sense |
Definition at line 2137 of file lpi_spx2.cpp.
References NULL, SCIP_OBJSEN_MAXIMIZE, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetObj(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetRowNames().
| SCIP_RETCODE SCIPlpiGetObj | ( | SCIP_LPI * | lpi, |
| int | firstcol, | ||
| int | lastcol, | ||
| SCIP_Real * | vals | ||
| ) |
gets objective coefficients from LP problem object
| lpi | LP interface structure |
| firstcol | first column to get objective coefficient for |
| lastcol | last column to get objective coefficient for |
| vals | array to store objective coefficients |
Definition at line 2154 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetBounds(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetObjsen().
| SCIP_RETCODE SCIPlpiGetBounds | ( | SCIP_LPI * | lpi, |
| int | firstcol, | ||
| int | lastcol, | ||
| SCIP_Real * | lbs, | ||
| SCIP_Real * | ubs | ||
| ) |
gets current bounds from LP problem object
| lpi | LP interface structure |
| firstcol | first column to get objective value for |
| lastcol | last column to get objective value for |
| lbs | array to store lower bound values, or NULL |
| ubs | array to store upper bound values, or NULL |
Definition at line 2177 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetSides(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetObj().
| SCIP_RETCODE SCIPlpiGetSides | ( | SCIP_LPI * | lpi, |
| int | firstrow, | ||
| int | lastrow, | ||
| SCIP_Real * | lhss, | ||
| SCIP_Real * | rhss | ||
| ) |
gets current row sides from LP problem object
| lpi | LP interface structure |
| firstrow | first row to get sides for |
| lastrow | last row to get sides for |
| lhss | array to store left hand side values, or NULL |
| rhss | array to store right hand side values, or NULL |
Definition at line 2205 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetCoef(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetBounds().
| SCIP_RETCODE SCIPlpiGetCoef | ( | SCIP_LPI * | lpi, |
| int | row, | ||
| int | col, | ||
| SCIP_Real * | val | ||
| ) |
gets a single coefficient
| lpi | LP interface structure |
| row | row number of coefficient |
| col | column number of coefficient |
| val | pointer to store the value of the coefficient |
Definition at line 2233 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::spx, and spxSolve().
Referenced by SCIPlpiGetSides().
|
static |
solves LP – used for both, primal and dual simplex, because SoPlex doesn't distinct the two cases
| lpi | LP interface structure |
Definition at line 2271 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiSolvePrimal(), SCIPmessagePrintWarning(), SCIP_LPi::solved, SOPLEX_VERBLEVEL, SCIP_LPi::spx, TRUE, and UNKNOWN.
Referenced by SCIPlpiGetCoef(), SCIPlpiSolveDual(), and SCIPlpiSolvePrimal().
| SCIP_RETCODE SCIPlpiSolvePrimal | ( | SCIP_LPI * | lpi | ) |
calls primal simplex to solve the LP
startFinishOptions - bits 1 - do not delete work areas and factorization at end 2 - use old factorization if same number of rows 4 - skip as much initialization of work areas as possible (work in progress)
4 does not seem to work.
Primal algorithm
| lpi | LP interface structure |
Definition at line 2340 of file lpi_spx2.cpp.
References NULL, SCIPdebugMessage, SCIPlpiSolveDual(), SCIP_LPi::spx, and spxSolve().
Referenced by spxSolve().
| SCIP_RETCODE SCIPlpiSolveDual | ( | SCIP_LPI * | lpi | ) |
calls dual simplex to solve the LP
startFinishOptions - bits 1 - do not delete work areas and factorization at end 2 - use old factorization if same number of rows 4 - skip as much initialization of work areas as possible (work in progress)
4 does not seem to work.
Dual algorithm
| lpi | LP interface structure |
Definition at line 2354 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiSolveBarrier(), SCIP_LPi::spx, and spxSolve().
Referenced by SCIPlpiSolveBarrier(), and SCIPlpiSolvePrimal().
| SCIP_RETCODE SCIPlpiSolveBarrier | ( | SCIP_LPI * | lpi, |
| SCIP_Bool | crossover | ||
| ) |
calls barrier or interior point algorithm to solve the LP with crossover to simplex basis
| lpi | LP interface structure |
| crossover | perform crossover |
Definition at line 2368 of file lpi_spx2.cpp.
References SCIPdebugMessage, SCIPlpiSolveDual(), and SCIPlpiStartStrongbranch().
Referenced by SCIPlpiSolveDual().
| SCIP_RETCODE SCIPlpiStartStrongbranch | ( | SCIP_LPI * | lpi | ) |
start strong branching - call before any strongbranching
| lpi | LP interface structure |
Definition at line 2380 of file lpi_spx2.cpp.
References SCIP_OKAY, SCIPlpiEndStrongbranch(), and SCIP_LPi::spx.
Referenced by SCIPlpiSolveBarrier().
| SCIP_RETCODE SCIPlpiEndStrongbranch | ( | SCIP_LPI * | lpi | ) |
end strong branching - call after any strongbranching
| lpi | LP interface structure |
Definition at line 2391 of file lpi_spx2.cpp.
References lpiStrongbranch(), SCIP_OKAY, and SCIP_LPi::spx.
Referenced by SCIPlpiStartStrongbranch().
|
static |
performs strong branching iterations on one arbitrary candidate
| 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 2404 of file lpi_spx2.cpp.
References EPSCEIL, EPSFLOOR, FALSE, NULL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiStrongbranchFrac(), SOPLEX_VERBLEVEL, SCIP_LPi::spx, and TRUE.
Referenced by SCIPlpiEndStrongbranch(), SCIPlpiStrongbranchesFrac(), SCIPlpiStrongbranchesInt(), SCIPlpiStrongbranchFrac(), and SCIPlpiStrongbranchInt().
| 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 | ||
| ) |
performs strong branching iterations on one fractional candidate
| lpi | LP interface structure |
| col | column to apply strong branching on |
| psol | fractional 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 2642 of file lpi_spx2.cpp.
References lpiStrongbranch(), SCIP_CALL, SCIP_LPERROR, SCIP_OKAY, and SCIPlpiStrongbranchesFrac().
Referenced by lpiStrongbranch().
| 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 | ||
| ) |
performs strong branching iterations on given fractional candidates
| lpi | LP interface structure |
| cols | columns to apply strong branching on |
| ncols | number of columns |
| psols | fractional current primal solution values of columns |
| 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 2672 of file lpi_spx2.cpp.
References lpiStrongbranch(), NULL, SCIP_CALL, SCIP_LPERROR, SCIP_OKAY, and SCIPlpiStrongbranchInt().
Referenced by SCIPlpiStrongbranchFrac().
| 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 | ||
| ) |
performs strong branching iterations on one candidate with integral value
| lpi | LP interface structure |
| col | column to apply strong branching on |
| psol | current integral 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 2716 of file lpi_spx2.cpp.
References lpiStrongbranch(), SCIP_CALL, SCIP_LPERROR, SCIP_OKAY, and SCIPlpiStrongbranchesInt().
Referenced by SCIPlpiStrongbranchesFrac().
| 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 | ||
| ) |
performs strong branching iterations on given candidates with integral values
| lpi | LP interface structure |
| cols | columns to apply strong branching on |
| ncols | number of columns |
| psols | current integral primal solution values of columns |
| 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 2746 of file lpi_spx2.cpp.
References lpiStrongbranch(), NULL, SCIP_Bool, SCIP_CALL, SCIP_LPERROR, SCIP_OKAY, and SCIPlpiWasSolved().
Referenced by SCIPlpiStrongbranchInt().
returns whether a solve method was called after the last modification of the LP
| lpi | LP interface structure |
Definition at line 2802 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPlpiGetSolFeasibility(), and SCIP_LPi::solved.
Referenced by SCIPlpiStrongbranchesInt().
| SCIP_RETCODE SCIPlpiGetSolFeasibility | ( | SCIP_LPI * | lpi, |
| SCIP_Bool * | primalfeasible, | ||
| SCIP_Bool * | dualfeasible | ||
| ) |
gets information about primal and dual feasibility of the current LP solution
| lpi | LP interface structure |
| primalfeasible | stores primal feasibility status |
| dualfeasible | stores dual feasibility status |
Definition at line 2812 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIP_OKAY, SCIPdebugMessage, SCIPlpiExistsPrimalRay(), SCIPlpiIsDualFeasible(), and SCIPlpiIsPrimalFeasible().
Referenced by SCIPlpiWasSolved().
returns TRUE iff LP is proven to have a primal unbounded ray (but not necessary a primal feasible point); this does not necessarily mean, that the solver knows and can return the primal ray
| lpi | LP interface structure |
Definition at line 2833 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiHasPrimalRay(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetSolFeasibility().
returns TRUE iff LP is proven to have a primal unbounded ray (but not necessary a primal feasible point), and the solver knows and can return the primal ray
| lpi | LP interface structure |
Definition at line 2848 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsPrimalUnbounded(), and SCIP_LPi::spx.
Referenced by SCIPlpiExistsPrimalRay().
returns TRUE iff LP is proven to be primal unbounded
| lpi | LP interface structure |
Definition at line 2861 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsPrimalInfeasible(), and SCIP_LPi::spx.
Referenced by SCIPlpiHasPrimalRay().
returns TRUE iff LP is proven to be primal infeasible
| lpi | LP interface structure |
Definition at line 2879 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsPrimalFeasible(), and SCIP_LPi::spx.
Referenced by SCIPlpiIsPrimalUnbounded().
returns TRUE iff LP is proven to be primal feasible
| lpi | LP interface structure |
Definition at line 2892 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiExistsDualRay(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetSolFeasibility(), SCIPlpiIsOptimal(), and SCIPlpiIsPrimalInfeasible().
returns TRUE iff LP is proven to have a dual unbounded ray (but not necessary a dual feasible point); this does not necessarily mean, that the solver knows and can return the dual ray
| lpi | LP interface structure |
Definition at line 2916 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiHasDualRay(), and SCIP_LPi::spx.
Referenced by SCIPlpiIsPrimalFeasible().
returns TRUE iff LP is proven to have a dual unbounded ray (but not necessary a dual feasible point), and the solver knows and can return the dual ray
| lpi | LP interface structure |
Definition at line 2931 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsDualUnbounded(), and SCIP_LPi::spx.
Referenced by SCIPlpiExistsDualRay().
returns TRUE iff LP is dual unbounded
| lpi | LP interface structure |
Definition at line 2944 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsDualInfeasible(), and SCIP_LPi::spx.
Referenced by SCIPlpiHasDualRay().
returns TRUE iff LP is dual infeasible
| lpi | LP interface structure |
Definition at line 2957 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsDualFeasible(), and SCIP_LPi::spx.
Referenced by SCIPlpiIsDualUnbounded().
returns TRUE iff LP is proven to be dual feasible
| lpi | LP interface structure |
Definition at line 2970 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsOptimal(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetSolFeasibility(), SCIPlpiIsDualInfeasible(), and SCIPlpiIsOptimal().
returns TRUE iff LP was solved to optimality
| lpi | LP interface structure |
Definition at line 2988 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsDualFeasible(), SCIPlpiIsPrimalFeasible(), SCIPlpiIsStable(), and SCIP_LPi::spx.
Referenced by SCIPlpiIsDualFeasible(), and SCIPlpiIsStable().
returns TRUE iff current LP basis is stable
| lpi | LP interface structure |
Definition at line 3005 of file lpi_spx2.cpp.
References SCIP_LPi::checkcondition, SCIP_LPi::conditionlimit, FALSE, NULL, SCIP_Bool, SCIP_INVALID, SCIP_LPSOLQUALITY_ESTIMCONDITION, SCIP_OKAY, SCIP_Real, SCIPABORT, SCIPdebugMessage, SCIPlpiGetRealSolQuality(), SCIPlpiIsObjlimExc(), SCIPlpiIsOptimal(), SCIP_LPi::spx, and TRUE.
Referenced by SCIPlpiIsOptimal().
returns TRUE iff the objective limit was reached
| lpi | LP interface structure |
Definition at line 3040 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsIterlimExc(), and SCIP_LPi::spx.
Referenced by SCIPlpiIsStable().
returns TRUE iff the iteration limit was reached
| lpi | LP interface structure |
Definition at line 3053 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIsTimelimExc(), and SCIP_LPi::spx.
Referenced by SCIPlpiIsObjlimExc().
returns TRUE iff the time limit was reached
| lpi | LP interface structure |
Definition at line 3066 of file lpi_spx2.cpp.
References NULL, SCIPdebugMessage, SCIPlpiGetInternalStatus(), and SCIP_LPi::spx.
Referenced by SCIPlpiIsIterlimExc().
| int SCIPlpiGetInternalStatus | ( | SCIP_LPI * | lpi | ) |
returns the internal solution status of the solver
| lpi | LP interface structure |
Definition at line 3079 of file lpi_spx2.cpp.
References NULL, SCIP_Bool, SCIPdebugMessage, SCIPlpiIgnoreInstability(), and SCIP_LPi::spx.
Referenced by SCIPlpiIsTimelimExc().
| SCIP_RETCODE SCIPlpiIgnoreInstability | ( | SCIP_LPI * | lpi, |
| SCIP_Bool * | success | ||
| ) |
tries to reset the internal status of the LP solver in order to ignore an instability of the last solving call
| lpi | LP interface structure |
| success | pointer to store, whether the instability could be ignored |
Definition at line 3092 of file lpi_spx2.cpp.
References FALSE, NULL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetObjval(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetInternalStatus().
| SCIP_RETCODE SCIPlpiGetObjval | ( | SCIP_LPI * | lpi, |
| SCIP_Real * | objval | ||
| ) |
gets objective value of solution
| lpi | LP interface structure |
| objval | stores the objective value |
Definition at line 3109 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetSol(), and SCIP_LPi::spx.
Referenced by SCIPlpiIgnoreInstability().
| SCIP_RETCODE SCIPlpiGetSol | ( | SCIP_LPI * | lpi, |
| SCIP_Real * | objval, | ||
| SCIP_Real * | primsol, | ||
| SCIP_Real * | dualsol, | ||
| SCIP_Real * | activity, | ||
| SCIP_Real * | redcost | ||
| ) |
gets primal and dual solution vectors
| lpi | LP interface structure |
| objval | stores the objective value, may be NULL if not needed |
| primsol | primal solution vector, may be NULL if not needed |
| dualsol | dual solution vector, may be NULL if not needed |
| activity | row activity vector, may be NULL if not needed |
| redcost | reduced cost vector, may be NULL if not needed |
Definition at line 3126 of file lpi_spx2.cpp.
References SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetPrimalRay(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetObjval().
| SCIP_RETCODE SCIPlpiGetPrimalRay | ( | SCIP_LPI * | lpi, |
| SCIP_Real * | ray | ||
| ) |
gets primal ray for unbounded LPs
Unbounded ray (NULL returned if none/wrong). Up to user to use delete [] on these arrays.
| lpi | LP interface structure |
| ray | primal ray |
Definition at line 3182 of file lpi_spx2.cpp.
References SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetDualfarkas(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetSol().
| SCIP_RETCODE SCIPlpiGetDualfarkas | ( | SCIP_LPI * | lpi, |
| SCIP_Real * | dualfarkas | ||
| ) |
gets dual farkas proof for infeasibility
Infeasibility ray (NULL returned if none/wrong). Up to user to use delete [] on these arrays.
| lpi | LP interface structure |
| dualfarkas | dual farkas row multipliers |
Definition at line 3214 of file lpi_spx2.cpp.
References SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetIterations(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetPrimalRay().
| SCIP_RETCODE SCIPlpiGetIterations | ( | SCIP_LPI * | lpi, |
| int * | iterations | ||
| ) |
gets the number of LP iterations of the last solve call
| lpi | LP interface structure |
| iterations | pointer to store the number of iterations of the last solve call |
Definition at line 3246 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetRealSolQuality(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetDualfarkas().
| SCIP_RETCODE SCIPlpiGetRealSolQuality | ( | SCIP_LPI * | lpi, |
| SCIP_LPSOLQUALITY | qualityindicator, | ||
| SCIP_Real * | quality | ||
| ) |
gets information about the quality of an LP solution
Such information is usually only available, if also a (maybe not optimal) solution is available. The LPI should return SCIP_INVALID for quality, if the requested quantity is not available.
| lpi | LP interface structure |
| qualityindicator | indicates which quality should be returned |
| quality | pointer to store quality number |
Definition at line 3266 of file lpi_spx2.cpp.
References NULL, SCIP_INVALID, SCIP_INVALIDDATA, SCIP_LPSOLQUALITY_ESTIMCONDITION, SCIP_LPSOLQUALITY_EXACTCONDITION, SCIP_OKAY, SCIPdebugMessage, SCIPerrorMessage, SCIPlpiGetBase(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetIterations(), and SCIPlpiIsStable().
| SCIP_RETCODE SCIPlpiGetBase | ( | SCIP_LPI * | lpi, |
| int * | cstat, | ||
| int * | rstat | ||
| ) |
gets current basis status for columns and rows; arrays must be large enough to store the basis status
| lpi | LP interface structure |
| cstat | array to store column basis status, or NULL |
| rstat | array to store row basis status, or NULL |
Definition at line 3322 of file lpi_spx2.cpp.
References NULL, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_INVALIDDATA, SCIP_LPERROR, SCIP_OKAY, SCIPABORT, SCIPdebugMessage, SCIPerrorMessage, SCIPlpiSetBase(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetRealSolQuality(), and SCIPlpiGetState().
| SCIP_RETCODE SCIPlpiSetBase | ( | SCIP_LPI * | lpi, |
| const int * | cstat, | ||
| const int * | rstat | ||
| ) |
sets current basis status for columns and rows
Whats changed since last solve. Is only used when startFinishOptions used in dual or primal. Bit 1 - number of rows/columns has not changed (so work arrays valid) 2 - matrix has not changed 4 - if matrix has changed only by adding rows 8 - if matrix has changed only by adding columns 16 - row lbs not changed 32 - row ubs not changed 64 - column objective not changed 128 - column lbs not changed 256 - column ubs not changed 512 - basis not changed (up to user to set this to 0) top bits may be used internally
| lpi | LP interface structure |
| cstat | array with column basis status |
| rstat | array with row basis status |
Definition at line 3411 of file lpi_spx2.cpp.
References invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_INVALIDDATA, SCIP_LPERROR, SCIP_OKAY, SCIPABORT, SCIPdebugMessage, SCIPerrorMessage, SCIPlpiGetBasisInd(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiGetBase(), and SCIPlpiSetState().
| SCIP_RETCODE SCIPlpiGetBasisInd | ( | SCIP_LPI * | lpi, |
| int * | bind | ||
| ) |
returns the indices of the basic columns and rows; basic column n gives value n, basic row m gives value -1-m
| lpi | LP interface structure |
| bind | pointer to store basis indices ready to keep number of rows entries |
Definition at line 3490 of file lpi_spx2.cpp.
References NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetBInvRow(), and SCIP_LPi::spx.
Referenced by SCIPlpiSetBase().
| SCIP_RETCODE SCIPlpiGetBInvRow | ( | SCIP_LPI * | lpi, |
| int | r, | ||
| SCIP_Real * | coef, | ||
| int * | inds, | ||
| int * | ninds | ||
| ) |
get dense row of inverse basis matrix B^-1
| lpi | LP interface structure |
| r | row number |
| coef | pointer to store the coefficients of the row |
| inds | array to store the non-zero indices |
| ninds | pointer to store the number of non-zero indices (-1: if we do not store sparsity informations) |
Definition at line 3514 of file lpi_spx2.cpp.
References NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetBInvCol(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetBasisInd(), and SCIPlpiGetBInvARow().
| SCIP_RETCODE SCIPlpiGetBInvCol | ( | SCIP_LPI * | lpi, |
| int | c, | ||
| SCIP_Real * | coef, | ||
| int * | inds, | ||
| int * | ninds | ||
| ) |
get dense column of inverse basis matrix B^-1
| lpi | LP interface structure |
| c | column number of B^-1; this is NOT the number of the column in the LP; you have to call SCIPlpiGetBasisInd() to get the array which links the B^-1 column numbers to the row and column numbers of the LP! c must be between 0 and nrows-1, since the basis has the size nrows * nrows |
| coef | pointer to store the coefficients of the column |
| inds | array to store the non-zero indices |
| ninds | pointer to store the number of non-zero indices (-1: if we do not store sparsity informations) |
Definition at line 3544 of file lpi_spx2.cpp.
References NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetBInvARow(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetBInvRow().
| SCIP_RETCODE SCIPlpiGetBInvARow | ( | SCIP_LPI * | lpi, |
| int | r, | ||
| const SCIP_Real * | binvrow, | ||
| SCIP_Real * | coef, | ||
| int * | inds, | ||
| int * | ninds | ||
| ) |
get dense row of inverse basis matrix times constraint matrix B^-1 * A
| lpi | LP interface structure |
| r | row number |
| binvrow | row in (A_B)^-1 from prior call to SCIPlpiGetBInvRow(), or NULL |
| coef | vector to return coefficients |
| inds | array to store the non-zero indices |
| ninds | pointer to store the number of non-zero indices (-1: if we do not store sparsity informations) |
Definition at line 3575 of file lpi_spx2.cpp.
References BMSallocMemoryArray, BMSfreeMemoryArrayNull, NULL, SCIP_ALLOC, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetBInvACol(), SCIPlpiGetBInvRow(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetBInvCol().
| SCIP_RETCODE SCIPlpiGetBInvACol | ( | SCIP_LPI * | lpi, |
| int | c, | ||
| SCIP_Real * | coef, | ||
| int * | inds, | ||
| int * | ninds | ||
| ) |
get dense column of inverse basis matrix times constraint matrix B^-1 * A
| lpi | LP interface structure |
| c | column number |
| coef | vector to return coefficients |
| inds | array to store the non-zero indices |
| ninds | pointer to store the number of non-zero indices (-1: if we do not store sparsity informations) |
Definition at line 3648 of file lpi_spx2.cpp.
References NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetState(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetBInvARow().
| SCIP_RETCODE SCIPlpiGetState | ( | SCIP_LPI * | lpi, |
| BMS_BLKMEM * | blkmem, | ||
| SCIP_LPISTATE ** | lpistate | ||
| ) |
stores LPi state (like basis information) into lpistate object
| lpi | LP interface structure |
| blkmem | block memory |
| lpistate | pointer to LPi state information (like basis information) |
Definition at line 3711 of file lpi_spx2.cpp.
References SCIP_LPi::cstat, ensureCstatMem(), ensureRstatMem(), lpistateCreate(), lpistatePack(), NULL, SCIP_LPi::rstat, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetBase(), SCIPlpiSetState(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetBInvACol().
| SCIP_RETCODE SCIPlpiSetState | ( | SCIP_LPI * | lpi, |
| BMS_BLKMEM * | , | ||
| const SCIP_LPISTATE * | lpistate | ||
| ) |
loads LPi state (like basis information) into solver; note that the LP might have been extended with additional columns and rows since the state was stored with SCIPlpiGetState()
| lpi | LP interface structure |
| lpistate | LPi state information (like basis information) |
Definition at line 3755 of file lpi_spx2.cpp.
References SCIP_LPi::cstat, ensureCstatMem(), ensureRstatMem(), lpistateUnpack(), SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, REALABS, SCIP_LPi::rstat, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiClearState(), SCIPlpiIsInfinity(), SCIPlpiSetBase(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetState().
| SCIP_RETCODE SCIPlpiClearState | ( | SCIP_LPI * | lpi | ) |
clears current LPi state (like basis information) of the solver
| lpi | LP interface structure |
Definition at line 3814 of file lpi_spx2.cpp.
References SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiFreeState(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiSetState().
| SCIP_RETCODE SCIPlpiFreeState | ( | SCIP_LPI * | lpi, |
| BMS_BLKMEM * | blkmem, | ||
| SCIP_LPISTATE ** | lpistate | ||
| ) |
frees LPi state information
| lpi | LP interface structure |
| blkmem | block memory |
| lpistate | pointer to LPi state information (like basis information) |
Definition at line 3844 of file lpi_spx2.cpp.
References lpistateFree(), NULL, SCIP_Bool, SCIP_OKAY, SCIPdebugMessage, and SCIPlpiHasStateBasis().
Referenced by SCIPlpiClearState().
| SCIP_Bool SCIPlpiHasStateBasis | ( | SCIP_LPI * | lpi, |
| SCIP_LPISTATE * | lpistate | ||
| ) |
checks, whether the given LP state contains simplex basis information
| lpi | LP interface structure |
| lpistate | LP state information (like basis information) |
Definition at line 3862 of file lpi_spx2.cpp.
References SCIPlpiReadState(), and TRUE.
Referenced by SCIPlpiFreeState().
| SCIP_RETCODE SCIPlpiReadState | ( | SCIP_LPI * | lpi, |
| const char * | fname | ||
| ) |
reads LP state (like basis information from a file
Read a basis from the given filename, returns -1 on file error, 0 if no values, 1 if values
| lpi | LP interface structure |
| fname | file name |
Definition at line 3871 of file lpi_spx2.cpp.
References SCIP_LPi::messagehdlr, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiWriteState(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiHasStateBasis().
| SCIP_RETCODE SCIPlpiWriteState | ( | SCIP_LPI * | lpi, |
| const char * | fname | ||
| ) |
writes LP state (like basis information) to a file
Write the basis in MPS format to the specified file. If writeValues true, writes values of structurals (and adds VALUES to end of NAME card)
parameters:
| lpi | LP interface structure |
| fname | file name |
Definition at line 3887 of file lpi_spx2.cpp.
References SCIP_LPi::messagehdlr, SCIP_LPERROR, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetNorms(), SOPLEX_TRY, and SCIP_LPi::spx.
Referenced by SCIPlpiReadState().
| SCIP_RETCODE SCIPlpiGetNorms | ( | SCIP_LPI * | lpi, |
| BMS_BLKMEM * | blkmem, | ||
| SCIP_LPINORMS ** | lpinorms | ||
| ) |
stores LPi pricing norms information
| lpi | LP interface structure |
| blkmem | block memory |
| lpinorms | pointer to LPi pricing norms information |
Definition at line 3920 of file lpi_spx2.cpp.
References BMSallocBlockMemory, BMSallocBlockMemoryArray, BMSfreeBlockMemory, BMSfreeBlockMemoryArray, NULL, SCIP_ALLOC, SCIP_OKAY, SCIPdebugMessage, SCIPlpiSetNorms(), and SCIP_LPi::spx.
Referenced by SCIPlpiWriteState().
| SCIP_RETCODE SCIPlpiSetNorms | ( | SCIP_LPI * | lpi, |
| BMS_BLKMEM * | blkmem, | ||
| const SCIP_LPINORMS * | lpinorms | ||
| ) |
loads LPi pricing norms into solver; note that the LP might have been extended with additional columns and rows since the state was stored with SCIPlpiGetNorms()
| lpi | LP interface structure |
| blkmem | block memory |
| lpinorms | LPi pricing norms information |
Definition at line 3975 of file lpi_spx2.cpp.
References SCIP_LPiNorms::ncols, SCIP_LPiNorms::norms, SCIP_LPiNorms::nrows, NULL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiFreeNorms(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetNorms().
| SCIP_RETCODE SCIPlpiFreeNorms | ( | SCIP_LPI * | lpi, |
| BMS_BLKMEM * | blkmem, | ||
| SCIP_LPINORMS ** | lpinorms | ||
| ) |
frees pricing norms information
| lpi | LP interface structure |
| blkmem | block memory |
| lpinorms | pointer to LPi pricing norms information |
Definition at line 4006 of file lpi_spx2.cpp.
References BMSfreeBlockMemory, BMSfreeBlockMemoryArray, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIPlpiGetIntpar().
Referenced by SCIPlpiSetNorms().
| SCIP_RETCODE SCIPlpiGetIntpar | ( | SCIP_LPI * | lpi, |
| SCIP_LPPARAM | type, | ||
| int * | ival | ||
| ) |
gets integer parameter of LP
| lpi | LP interface structure |
| type | parameter number |
| ival | buffer to store the parameter value |
Definition at line 4039 of file lpi_spx2.cpp.
References NULL, SCIP_LPi::pricing, SCIP_LPPAR_FROMSCRATCH, SCIP_LPPAR_LPINFO, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_PRESOLVING, SCIP_LPPAR_PRICING, SCIP_LPPAR_RANDOMSEED, SCIP_LPPAR_SCALING, SCIP_LPPAR_TIMING, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIPdebugMessage, SCIPlpiSetIntpar(), and SCIP_LPi::spx.
Referenced by SCIPlpiFreeNorms().
| SCIP_RETCODE SCIPlpiSetIntpar | ( | SCIP_LPI * | lpi, |
| SCIP_LPPARAM | type, | ||
| int | ival | ||
| ) |
sets integer parameter of LP
Amount of print out: 0 - none 1 - just final 2 - just factorizations 3 - as 2 plus a bit more 4 - verbose above that 8,16,32 etc just for selective SCIPdebug
| lpi | LP interface structure |
| type | parameter number |
| ival | parameter value |
Definition at line 4103 of file lpi_spx2.cpp.
References FALSE, NULL, SCIP_LPi::pricing, SCIP_LPERROR, SCIP_LPPAR_FROMSCRATCH, SCIP_LPPAR_LPINFO, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_POLISHING, SCIP_LPPAR_PRESOLVING, SCIP_LPPAR_PRICING, SCIP_LPPAR_RANDOMSEED, SCIP_LPPAR_SCALING, SCIP_LPPAR_TIMING, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIP_PRICING_AUTO, SCIP_PRICING_DEVEX, SCIP_PRICING_FULL, SCIP_PRICING_LPIDEFAULT, SCIP_PRICING_PARTIAL, SCIP_PRICING_STEEP, SCIP_PRICING_STEEPQSTART, SCIPdebugMessage, SCIPlpiGetRealpar(), SCIP_LPi::spx, and TRUE.
Referenced by SCIPlpiCreate(), and SCIPlpiGetIntpar().
| SCIP_RETCODE SCIPlpiGetRealpar | ( | SCIP_LPI * | lpi, |
| SCIP_LPPARAM | type, | ||
| SCIP_Real * | dval | ||
| ) |
gets floating point parameter of LP
| lpi | LP interface structure |
| type | parameter number |
| dval | buffer to store the parameter value |
Definition at line 4196 of file lpi_spx2.cpp.
References SCIP_LPi::conditionlimit, NULL, SCIP_LPPAR_CONDITIONLIMIT, SCIP_LPPAR_DUALFEASTOL, SCIP_LPPAR_FEASTOL, SCIP_LPPAR_LOBJLIM, SCIP_LPPAR_LPTILIM, SCIP_LPPAR_ROWREPSWITCH, SCIP_LPPAR_UOBJLIM, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIPdebugMessage, SCIPlpiInfinity(), SCIPlpiSetRealpar(), and SCIP_LPi::spx.
Referenced by SCIPlpiSetIntpar().
| SCIP_RETCODE SCIPlpiSetRealpar | ( | SCIP_LPI * | lpi, |
| SCIP_LPPARAM | type, | ||
| SCIP_Real | dval | ||
| ) |
sets floating point parameter of LP
| lpi | LP interface structure |
| type | parameter number |
| dval | parameter value |
Definition at line 4241 of file lpi_spx2.cpp.
References SCIP_LPi::checkcondition, SCIP_LPi::conditionlimit, NULL, SCIP_LPPAR_CONDITIONLIMIT, SCIP_LPPAR_DUALFEASTOL, SCIP_LPPAR_FEASTOL, SCIP_LPPAR_LOBJLIM, SCIP_LPPAR_LPTILIM, SCIP_LPPAR_ROWREPSWITCH, SCIP_LPPAR_UOBJLIM, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIP_Real, SCIPdebugMessage, SCIPlpiInfinity(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetRealpar().
returns value treated as infinity in the LP solver
| lpi | LP interface structure |
Definition at line 4300 of file lpi_spx2.cpp.
References SCIP_Bool, SCIP_Real, SCIPdebugMessage, SCIPlpiIsInfinity(), and SCIP_LPi::spx.
Referenced by SCIPlpiGetRealpar(), and SCIPlpiSetRealpar().
checks if given value is treated as infinity in the LP solver
| lpi | LP interface structure |
| val | value to be checked for infinity |
Definition at line 4310 of file lpi_spx2.cpp.
References fileExists(), SCIP_Bool, SCIPdebugMessage, and SCIP_LPi::spx.
Referenced by SCIPlpiChgBounds(), SCIPlpiInfinity(), and SCIPlpiSetState().
|
static |
returns, whether the given file exists
| filename | file name |
Definition at line 4334 of file lpi_spx2.cpp.
References FALSE, NULL, SCIPlpiReadLP(), and TRUE.
Referenced by SCIPlpiIsInfinity(), and SCIPlpiReadLP().
| SCIP_RETCODE SCIPlpiReadLP | ( | SCIP_LPI * | lpi, |
| const char * | fname | ||
| ) |
reads LP from a file
read file in MPS format parameters: filename bool keepNames bool ignoreErrors
| lpi | LP interface structure |
| fname | file name |
Definition at line 4350 of file lpi_spx2.cpp.
References fileExists(), SCIP_LPi::messagehdlr, NULL, SCIP_NOFILE, SCIP_OKAY, SCIP_READERROR, SCIPdebugMessage, SCIPlpiWriteLP(), SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by fileExists().
| SCIP_RETCODE SCIPlpiWriteLP | ( | SCIP_LPI * | lpi, |
| const char * | fname | ||
| ) |
writes LP to a file
write file in MPS format parameters: filename int formatType (0 - normal, 1 - extra accuracy, 2 - IEEE hex) int numberAcross (1 or 2 values should be specified on every data line in the MPS file) double objSense
| lpi | LP interface structure |
| fname | file name |
Definition at line 4387 of file lpi_spx2.cpp.
References SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIP_WRITEERROR, SCIPdebugMessage, SCIPmessagePrintWarning(), and SCIP_LPi::spx.
Referenced by SCIPlpiReadLP().
|
static |
Definition at line 930 of file lpi_spx2.cpp.
Referenced by SCIPlpiGetSolverName().
|
static |
Definition at line 931 of file lpi_spx2.cpp.
Referenced by SCIPlpiGetSolverDesc().