SCIP
Solving Constraint Integer Programs
Solving Constraint Integer Programs
LP interface for QSopt version >= 070303.
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.
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 |
| #define COLS_PER_PACKET SCIP_DUALPACKETSIZE |
Definition at line 32 of file lpi_qso.c.
Referenced by colpacketNum().
| #define ROWS_PER_PACKET SCIP_DUALPACKETSIZE |
Definition at line 34 of file lpi_qso.c.
Referenced by rowpacketNum().
| #define FEASTOL 1e-6 |
(feasibility) tolerance for qsopt
Definition at line 79 of file lpi_qso.c.
Referenced by SCIPlpiGetSol(), SCIPlpiStrongbranchesFrac(), SCIPlpiStrongbranchesInt(), SCIPlpiStrongbranchFrac(), and SCIPlpiStrongbranchInt().
| #define EPSILON 1e-9 |
tolerance for testing equality
Definition at line 82 of file lpi_qso.c.
Referenced by convertSides().
| #define QS_TESTG | ( | A, | |
| B, | |||
| C | |||
| ) |
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 89 of file lpi_qso.c.
Referenced by SCIPlpiGetCols(), SCIPlpiGetRows(), SCIPlpiGetSides(), SCIPlpiScaleCol(), and SCIPlpiScaleRow().
| #define QS_ERROR | ( | A, | |
| ... | |||
| ) |
This macro is to print error messages and to exit with SCIP_LPERROR.
Definition at line 96 of file lpi_qso.c.
Referenced by SCIPlpiAddRows(), SCIPlpiGetColNames(), SCIPlpiGetRowNames(), and SCIPlpiWriteState().
| #define QS_RETURN | ( | A | ) |
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 104 of file lpi_qso.c.
Referenced by SCIPlpiAddCols(), SCIPlpiChgBounds(), SCIPlpiChgCoef(), SCIPlpiDelCols(), SCIPlpiDelRows(), SCIPlpiGetBInvRow(), SCIPlpiGetBounds(), SCIPlpiGetCoef(), SCIPlpiGetCols(), SCIPlpiGetDualfarkas(), SCIPlpiGetIntpar(), SCIPlpiGetObj(), SCIPlpiGetObjval(), SCIPlpiGetRealpar(), SCIPlpiGetRows(), SCIPlpiGetSides(), SCIPlpiLoadColLP(), SCIPlpiScaleCol(), SCIPlpiScaleRow(), SCIPlpiSetBase(), SCIPlpiSetIntpar(), SCIPlpiSetNorms(), SCIPlpiSetRealpar(), SCIPlpiSetState(), SCIPlpiSolveDual(), and SCIPlpiSolvePrimal().
| #define QS_CONDRET | ( | A | ) |
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 114 of file lpi_qso.c.
Referenced by SCIPlpiChgBounds(), SCIPlpiChgObj(), SCIPlpiChgObjsen(), SCIPlpiChgSides(), SCIPlpiClear(), SCIPlpiDelColset(), SCIPlpiDelRowset(), SCIPlpiGetBase(), SCIPlpiGetBasisInd(), SCIPlpiGetBInvARow(), SCIPlpiGetIterations(), SCIPlpiGetNorms(), SCIPlpiGetSol(), SCIPlpiLoadColLP(), SCIPlpiSetBase(), SCIPlpiSetState(), SCIPlpiStrongbranchesFrac(), SCIPlpiStrongbranchesInt(), SCIPlpiStrongbranchFrac(), and SCIPlpiStrongbranchInt().
| typedef SCIP_DUALPACKET COLPACKET |
| typedef SCIP_DUALPACKET ROWPACKET |
|
static |
returns the number of packets needed to store column packet information
| ncols | number of columns to store |
Definition at line 140 of file lpi_qso.c.
References COLS_PER_PACKET.
Referenced by lpistateCreate(), and lpistateFree().
|
static |
returns the number of packets needed to store row packet information
| nrows | number of rows to store |
Definition at line 149 of file lpi_qso.c.
References ROWS_PER_PACKET.
Referenced by 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 158 of file lpi_qso.c.
References SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, SCIP_LPiState::packcstat, SCIP_LPiState::packrstat, and SCIPencodeDualBit().
Referenced by 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 174 of file lpi_qso.c.
References SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, SCIP_LPiState::packcstat, SCIP_LPiState::packrstat, and SCIPdecodeDualBit().
Referenced by 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 190 of file lpi_qso.c.
References BMSallocBlockMemory, BMSallocBlockMemoryArray, colpacketNum(), NULL, rowpacketNum(), SCIP_ALLOC, and SCIP_OKAY.
Referenced by SCIPlpiGetState().
|
static |
frees LPi state information
| lpistate | pointer to LPi state information (like basis information) |
| blkmem | block memory |
Definition at line 211 of file lpi_qso.c.
References BMSfreeBlockMemory, BMSfreeBlockMemoryArray, colpacketNum(), NULL, and rowpacketNum().
Referenced by SCIPlpiFreeState().
|
static |
ensure size of column-related arrays
| lpi | pointer to an LP interface structure |
| sz | size |
Definition at line 233 of file lpi_qso.c.
References BMSreallocMemoryArray, SCIP_LPi::ibas, SCIP_LPi::itab, SCIP_ALLOC, SCIP_OKAY, and SCIP_LPi::tbsz.
Referenced by SCIPlpiGetBase(), SCIPlpiGetBInvARow(), SCIPlpiGetSol(), SCIPlpiSetBase(), and SCIPlpiSetState().
|
static |
ensure size of column-related arrays
| lpi | pointer to an LP interface structure |
| ncols | number of columns |
Definition at line 249 of file lpi_qso.c.
References BMSreallocMemoryArray, SCIP_LPi::colspace, SCIP_LPi::iccha, SCIP_LPi::iccnt, SCIP_ALLOC, and SCIP_OKAY.
Referenced by SCIPlpiAddCols(), SCIPlpiChgBounds(), SCIPlpiClear(), SCIPlpiDelCols(), SCIPlpiGetBounds(), SCIPlpiGetCols(), SCIPlpiGetObj(), SCIPlpiGetState(), SCIPlpiLoadColLP(), and SCIPlpiSetState().
|
static |
ensure size of row-related arrays
| lpi | pointer to an LP interface structure |
| nrows | number of rows |
Definition at line 265 of file lpi_qso.c.
References BMSreallocMemoryArray, SCIP_LPi::irbeg, SCIP_LPi::ircnt, SCIP_LPi::irhs, SCIP_LPi::irng, SCIP_LPi::isen, SCIP_LPi::rowspace, SCIP_ALLOC, and SCIP_OKAY.
Referenced by SCIPlpiAddRows(), SCIPlpiChgSides(), SCIPlpiClear(), SCIPlpiDelRows(), SCIPlpiGetBase(), SCIPlpiGetRows(), SCIPlpiGetSides(), SCIPlpiGetSol(), SCIPlpiGetState(), SCIPlpiLoadColLP(), SCIPlpiSetBase(), and SCIPlpiSetState().
|
static |
transform lhs/rhs into qsopt format
| lpi | pointer to an LP interface structure |
| nrows | number of rows |
| lhs | left hand side |
| rhs | right hand side |
Definition at line 284 of file lpi_qso.c.
References EPSEQ, EPSILON, SCIP_LPi::irbeg, SCIP_LPi::ircnt, SCIP_LPi::irhs, SCIP_LPi::irng, SCIP_LPi::isen, SCIP_INVALIDDATA, SCIP_OKAY, SCIPABORT, and SCIPerrorMessage.
Referenced by SCIPlpiAddRows(), SCIPlpiChgSides(), and SCIPlpiLoadColLP().
| const char* SCIPlpiGetSolverName | ( | void | ) |
gets name and version of LP solver
Definition at line 349 of file lpi_qso.c.
References SCIP_MAXSTRLEN.
| const char* SCIPlpiGetSolverDesc | ( | void | ) |
| 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 374 of file lpi_qso.c.
References SCIP_LPi::prob.
| SCIP_RETCODE SCIPlpiSetIntegralityInformation | ( | SCIP_LPI * | lpi, |
| int | ncols, | ||
| int * | intInfo | ||
| ) |
pass integrality information to LP solver
| lpi | pointer to an LP interface structure |
| ncols | length of integrality array |
| intInfo | integrality array (0: continuous, 1: integer) |
Definition at line 382 of file lpi_qso.c.
References SCIP_LPERROR, and SCIPerrorMessage.
| 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 405 of file lpi_qso.c.
References BMSallocMemory, BMSallocMemoryArray, SCIP_LPi::messagehdlr, NULL, SCIP_ALLOC, SCIP_Bool, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, and SCIPerrorMessage.
| SCIP_RETCODE SCIPlpiFree | ( | SCIP_LPI ** | lpi | ) |
deletes an LP problem object
| lpi | pointer to an LP interface structure |
Definition at line 451 of file lpi_qso.c.
References BMSfreeMemory, BMSfreeMemoryArray, NULL, SCIP_OKAY, and SCIPdebugMessage.
| 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 | ||
| ) |
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 |
| rownames | row names, or NULL |
| 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 491 of file lpi_qso.c.
References convertSides(), ensureColMem(), ensureRowMem(), SCIP_LPi::iccnt, SCIP_LPi::irbeg, SCIP_LPi::ircnt, SCIP_LPi::irhs, SCIP_LPi::irng, SCIP_LPi::isen, NULL, SCIP_LPi::prob, QS_CONDRET, QS_RETURN, SCIP_CALL, SCIP_OBJSEN_MAXIMIZE, SCIP_Real, SCIPdebugMessage, SCIPlpiClear(), and SCIP_LPi::solstat.
| 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 | ||
| ) |
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 |
| colnames | column names, or NULL |
| 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 568 of file lpi_qso.c.
References BMSallocMemoryArray, BMSfreeMemoryArray, ensureColMem(), SCIP_LPi::iccnt, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_RETURN, SCIP_ALLOC, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 656 of file lpi_qso.c.
References ensureColMem(), SCIP_LPi::iccnt, NULL, SCIP_LPi::prob, QS_RETURN, SCIP_CALL, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 685 of file lpi_qso.c.
References SCIP_LPi::ncols, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 | ||
| ) |
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 |
| rownames | row names, or NULL |
| 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 720 of file lpi_qso.c.
References convertSides(), ensureRowMem(), SCIP_LPi::irbeg, SCIP_LPi::ircnt, SCIP_LPi::irhs, SCIP_LPi::irng, SCIP_LPi::isen, SCIP_LPi::ncols, NULL, SCIP_LPi::prob, QS_ERROR, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 804 of file lpi_qso.c.
References BMSallocMemoryArray, SCIP_LPi::ncols, NULL, SCIP_LPi::prob, QS_ERROR, SCIP_ALLOC, SCIP_OKAY, and SCIPdebugMessage.
| 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 867 of file lpi_qso.c.
References BMSallocMemoryArray, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_ERROR, SCIP_ALLOC, SCIP_OKAY, and SCIPdebugMessage.
| 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 929 of file lpi_qso.c.
References ensureRowMem(), SCIP_LPi::ircnt, NULL, SCIP_LPi::prob, QS_RETURN, SCIP_CALL, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 957 of file lpi_qso.c.
References SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::solstat.
| SCIP_RETCODE SCIPlpiClear | ( | SCIP_LPI * | lpi | ) |
clears the whole LP
| lpi | LP interface structure |
Definition at line 998 of file lpi_qso.c.
References ensureColMem(), ensureRowMem(), SCIP_LPi::iccnt, SCIP_LPi::ircnt, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::solstat.
Referenced by SCIPlpiLoadColLP().
| 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 1037 of file lpi_qso.c.
References ensureColMem(), SCIP_LPi::iccha, SCIP_LPi::ncols, NULL, SCIP_LPi::prob, QS_CONDRET, QS_RETURN, SCIP_CALL, SCIP_LPERROR, SCIP_Real, SCIPdebugMessage, SCIPdebugPrintf, SCIPerrorMessage, SCIPlpiIsInfinity(), and SCIP_LPi::solstat.
| 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 1088 of file lpi_qso.c.
References convertSides(), ensureRowMem(), SCIP_LPi::irhs, SCIP_LPi::irng, SCIP_LPi::isen, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 1130 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, SCIPdebugMessage, and SCIP_LPi::solstat.
| SCIP_RETCODE SCIPlpiChgObjsen | ( | SCIP_LPI * | lpi, |
| SCIP_OBJSEN | objsen | ||
| ) |
changes the objective sense
| lpi | LP interface structure |
| objsen | new objective sense |
Definition at line 1152 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_OBJSEN_MAXIMIZE, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 1180 of file lpi_qso.c.
References SCIP_LPi::ncols, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 1205 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, QS_TESTG, SCIPdebugMessage, SCIPerrorMessage, and SCIP_LPi::solstat.
| 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 1307 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, QS_TESTG, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 1401 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_OKAY, and SCIPdebugMessage.
| 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 1418 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_OKAY, and SCIPdebugMessage.
| 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 1435 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_OKAY, and SCIPdebugMessage.
| 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 1454 of file lpi_qso.c.
References ensureColMem(), SCIP_LPi::iccnt, NULL, SCIP_LPi::prob, QS_RETURN, QS_TESTG, SCIP_CALL, and SCIPdebugMessage.
| 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 1548 of file lpi_qso.c.
References ensureRowMem(), SCIP_LPi::ircnt, NULL, SCIP_LPi::prob, QS_RETURN, QS_TESTG, SCIP_CALL, SCIP_INVALIDDATA, SCIPABORT, SCIPdebugMessage, and SCIPerrorMessage.
| SCIP_RETCODE SCIPlpiGetObjsen | ( | SCIP_LPI * | lpi, |
| SCIP_OBJSEN * | objsen | ||
| ) |
gets the objective sense of the LP
| lpi | LP interface structure |
| objsen | pointer to store objective sense |
Definition at line 1659 of file lpi_qso.c.
References SCIP_LPERROR, and SCIPerrorMessage.
| 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 1669 of file lpi_qso.c.
References ensureColMem(), SCIP_LPi::iccnt, NULL, SCIP_LPi::prob, QS_RETURN, SCIP_CALL, and SCIPdebugMessage.
| 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 1699 of file lpi_qso.c.
References ensureColMem(), SCIP_LPi::iccnt, NULL, SCIP_LPi::prob, QS_RETURN, SCIP_CALL, and SCIPdebugMessage.
| 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 1729 of file lpi_qso.c.
References ensureRowMem(), SCIP_LPi::ircnt, NULL, SCIP_LPi::prob, QS_RETURN, QS_TESTG, SCIP_CALL, SCIP_INVALIDDATA, SCIPABORT, SCIPdebugMessage, and SCIPerrorMessage.
| 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 1799 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, and SCIPdebugMessage.
| 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 1831 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 1849 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, SCIPdebugMessage, and SCIP_LPi::solstat.
Referenced by SCIPlpiSolveBarrier().
| 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 1867 of file lpi_qso.c.
References SCIPlpiSolveDual().
| 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 | ||
| ) |
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 1894 of file lpi_qso.c.
References EPSISINT, FEASTOL, NULL, SCIP_LPi::previt, SCIP_LPi::prob, QS_CONDRET, SCIP_OKAY, SCIPdebugMessage, and TRUE.
| 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 1941 of file lpi_qso.c.
References EPSISINT, FEASTOL, SCIP_LPi::ncols, NULL, SCIP_LPi::previt, SCIP_LPi::prob, QS_CONDRET, SCIP_OKAY, SCIPdebugMessage, and TRUE.
| 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 1994 of file lpi_qso.c.
References EPSISINT, FEASTOL, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, and TRUE.
| 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 2040 of file lpi_qso.c.
References EPSISINT, FEASTOL, SCIP_LPi::ncols, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, and TRUE.
returns whether a solve method was called after the last modification of the LP
| lpi | LP interface structure |
Definition at line 2101 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, and SCIP_LPi::solstat.
| 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 2114 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::solstat.
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 2139 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
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 2156 of file lpi_qso.c.
References FALSE, NULL, SCIP_LPi::prob, and SCIPdebugMessage.
returns TRUE iff LP is proven to be primal unbounded
| lpi | LP interface structure |
Definition at line 2170 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff LP is proven to be primal infeasible
| lpi | LP interface structure |
Definition at line 2185 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff LP is proven to be primal feasible
| lpi | LP interface structure |
Definition at line 2200 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
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 2217 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
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 2234 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff LP is dual unbounded
| lpi | LP interface structure |
Definition at line 2249 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff LP is dual infeasible
| lpi | LP interface structure |
Definition at line 2264 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff LP is proven to be dual feasible
| lpi | LP interface structure |
Definition at line 2279 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff LP was solved to optimality
| lpi | LP interface structure |
Definition at line 2294 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff current LP basis is stable
| lpi | LP interface structure |
Definition at line 2309 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff the objective limit was reached
| lpi | LP interface structure |
Definition at line 2324 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff the iteration limit was reached
| lpi | LP interface structure |
Definition at line 2339 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
returns TRUE iff the time limit was reached
| lpi | LP interface structure |
Definition at line 2354 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
| int SCIPlpiGetInternalStatus | ( | SCIP_LPI * | lpi | ) |
returns the internal solution status of the solver
| lpi | LP interface structure |
Definition at line 2369 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 2384 of file lpi_qso.c.
References FALSE, NULL, SCIP_LPi::prob, SCIP_OKAY, and SCIPdebugMessage.
| 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 2401 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, and SCIPdebugMessage.
| 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 2419 of file lpi_qso.c.
References ensureRowMem(), ensureTabMem(), FEASTOL, SCIP_LPi::ibas, SCIP_LPi::irhs, SCIP_LPi::irng, SCIP_LPi::isen, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPABORT, SCIPdebugMessage, and SCIPerrorMessage.
| 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 2539 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_LPERROR, and SCIPerrorMessage.
| 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 2553 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, and SCIPdebugMessage.
| 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 2573 of file lpi_qso.c.
References NULL, SCIP_LPi::previt, SCIP_LPi::prob, QS_CONDRET, and SCIP_OKAY.
| 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 2598 of file lpi_qso.c.
References NULL, SCIP_INVALID, and SCIP_OKAY.
| 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 2625 of file lpi_qso.c.
References ensureRowMem(), ensureTabMem(), SCIP_LPi::ibas, SCIP_LPi::isen, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPABORT, SCIPdebugMessage, and SCIPerrorMessage.
Referenced by 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 2713 of file lpi_qso.c.
References ensureRowMem(), ensureTabMem(), SCIP_LPi::ibas, SCIP_LPi::isen, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, QS_RETURN, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_CALL, SCIP_INVALIDDATA, SCIPABORT, SCIPdebugMessage, and SCIPerrorMessage.
Referenced by SCIPlpiClearState().
| 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 2796 of file lpi_qso.c.
References SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 2840 of file lpi_qso.c.
References SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_RETURN, and SCIPdebugMessage.
| 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 2882 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_LPERROR, and SCIPerrorMessage.
| 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 2912 of file lpi_qso.c.
References ensureTabMem(), SCIP_LPi::itab, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_CALL, SCIP_OKAY, and SCIPdebugMessage.
| 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 2961 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_LPERROR, and SCIPerrorMessage.
| 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 2992 of file lpi_qso.c.
References ensureColMem(), ensureRowMem(), SCIP_LPi::iccnt, SCIP_LPi::ircnt, lpistateCreate(), lpistatePack(), SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIPlpiGetBase().
| SCIP_RETCODE SCIPlpiSetState | ( | SCIP_LPI * | lpi, |
| BMS_BLKMEM * | 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 |
| blkmem | block memory |
| lpistate | LPi state information (like basis information) |
Definition at line 3031 of file lpi_qso.c.
References ensureColMem(), ensureRowMem(), ensureTabMem(), SCIP_LPi::ibas, SCIP_LPi::iccnt, SCIP_LPi::ircnt, SCIP_LPi::isen, lpistateUnpack(), SCIP_LPi::ncols, SCIP_LPiState::ncols, SCIP_LPi::nrows, SCIP_LPiState::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, QS_RETURN, REALABS, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIPABORT, SCIPdebugMessage, SCIPerrorMessage, and SCIPlpiIsInfinity().
| SCIP_RETCODE SCIPlpiClearState | ( | SCIP_LPI * | lpi | ) |
clears current LPi state (like basis information) of the solver
| lpi | LP interface structure |
Definition at line 3157 of file lpi_qso.c.
References BMSallocMemoryArray, BMSfreeMemoryArray, SCIP_LPi::cstat, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, SCIP_LPi::rstat, SCIP_ALLOC, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIPlpiSetBase().
| 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 3195 of file lpi_qso.c.
References lpistateFree(), NULL, and SCIP_OKAY.
| SCIP_Bool SCIPlpiHasStateBasis | ( | SCIP_LPI * | lpi, |
| SCIP_LPISTATE * | lpistate | ||
| ) |
| 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 3220 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_OKAY, SCIP_READERROR, SCIPdebugMessage, and SCIPerrorMessage.
| 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 3243 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_ERROR, SCIP_OKAY, SCIP_WRITEERROR, SCIPdebugMessage, and SCIPerrorMessage.
| 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 3286 of file lpi_qso.c.
References BMSallocBlockMemory, BMSallocBlockMemoryArray, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::prob, QS_CONDRET, SCIP_ALLOC, and SCIP_OKAY.
| 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 3330 of file lpi_qso.c.
References SCIP_LPiNorms::cstat, SCIP_LPi::ncols, SCIP_LPiNorms::ncols, SCIP_LPiNorms::norms, SCIP_LPi::nrows, SCIP_LPiNorms::nrows, NULL, SCIP_LPi::prob, QS_RETURN, SCIP_LPiNorms::rstat, and SCIP_OKAY.
| 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 3360 of file lpi_qso.c.
References BMSfreeBlockMemory, BMSfreeBlockMemoryArray, NULL, and SCIP_OKAY.
| 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 3393 of file lpi_qso.c.
References FALSE, NULL, SCIP_LPi::pricing, SCIP_LPi::prob, QS_RETURN, SCIP_LPPAR_FASTMIP, SCIP_LPPAR_FROMSCRATCH, SCIP_LPPAR_LPINFO, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_PRESOLVING, SCIP_LPPAR_PRICING, SCIP_LPPAR_SCALING, SCIP_PARAMETERUNKNOWN, SCIPdebugMessage, and TRUE.
| 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 3439 of file lpi_qso.c.
References NULL, SCIP_LPi::pricing, SCIP_LPi::prob, QS_RETURN, SCIP_LPERROR, SCIP_LPPAR_LPINFO, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_PRICING, SCIP_LPPAR_SCALING, SCIP_PARAMETERUNKNOWN, SCIP_PRICING_AUTO, SCIP_PRICING_DEVEX, SCIP_PRICING_FULL, SCIP_PRICING_LPIDEFAULT, SCIP_PRICING_PARTIAL, SCIP_PRICING_STEEP, SCIP_PRICING_STEEPQSTART, and SCIPdebugMessage.
| 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 3501 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, SCIP_LPPAR_BARRIERCONVTOL, SCIP_LPPAR_DUALFEASTOL, SCIP_LPPAR_FEASTOL, SCIP_LPPAR_LOBJLIM, SCIP_LPPAR_LPTILIM, SCIP_LPPAR_MARKOWITZ, SCIP_LPPAR_UOBJLIM, SCIP_PARAMETERUNKNOWN, and SCIPdebugMessage.
| 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 3538 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, QS_RETURN, SCIP_LPPAR_BARRIERCONVTOL, SCIP_LPPAR_DUALFEASTOL, SCIP_LPPAR_FEASTOL, SCIP_LPPAR_LOBJLIM, SCIP_LPPAR_LPTILIM, SCIP_LPPAR_MARKOWITZ, SCIP_LPPAR_UOBJLIM, SCIP_PARAMETERUNKNOWN, and SCIPdebugMessage.
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 3594 of file lpi_qso.c.
Referenced by SCIPlpiChgBounds(), and SCIPlpiSetState().
| 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 3615 of file lpi_qso.c.
References NULL, SCIP_LPi::previt, SCIP_LPi::prob, SCIP_OKAY, SCIP_READERROR, SCIPdebugMessage, and SCIP_LPi::solstat.
| 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 3639 of file lpi_qso.c.
References NULL, SCIP_LPi::prob, SCIP_OKAY, SCIP_WRITEERROR, and SCIPdebugMessage.