lpi_clp.cpp
Go to the documentation of this file.
35 * - Currently, Clp (Version 1.16) supports two ways of adding rows/columns from arrays: One uses a
38 * variant. Since for LPI there should be no gaps in the corresponding arrays, i.e., every entry in
39 * @p val and @a ind gives a nonzero entry, one can switch between the two formats. With the current
56 * - Clp needs the setting of several special flags to make sure that necessary data (e.g., rays etc.)
57 * are available. If the FASTMIP option in SCIP is true, some settings that are supposed to be faster
58 * are used. We tried to use the best settings, while still working correctly. These settings probably
62 * isProvenPrimalInfeasible(). Currently (Version 1.16) no change in the Clp functions will be made,
67/*--+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
95/* for debugging: alternatingly write files "debug_[p|d]_[0|1].mps" after each run - use with care! */
117 int lastalgorithm; /**< type of last algorithm call (0 = none, 1 = primal, -1 = dual, 2 = barrier) */
126typedef SCIP_DUALPACKET COLPACKET; /* each column needs two bits of information (basic/on_lower/on_upper) */
128typedef SCIP_DUALPACKET ROWPACKET; /* each row needs two bit of information (basic/on_lower/on_upper) */
379 * 256 - Normally Clp keeps a scaled row copy for speed. For very large problems you might want to turn it off.
384 * 8192 - If the primal has a perturbed problem and needs to clean up, it normally uses dual - but in some cases can be better to use primal.
467 return "COIN-OR Linear Programming Solver developed by J. Forrest et.al. (projects.coin-or.org/Clp)";
851 // Current Clp version (1.8) can't delete a range of columns; we have to use deleteColumns (see SCIPlpiDelColset)
867/** deletes columns from SCIP_LPI; the new position of a column must not be greater that its old position */
1000 // Current Clp version (1.8) can't delete a range of rows; we have to use deleteRows (see SCIPlpiDelRowset)
1017/** deletes rows from SCIP_LP; the new position of a row must not be greater that its old position */
1105 /* The following bugfix was necessary some time ago to avoid an error in Clp and can currently be disabled: the
1106 * solution vector is modified to be set to the corresponding bounds. Remove if Clp versions have stabilized. */
1260 clp->setObjCoeff(ind[j], obj[j]); // inlined version of clp->setObjectiveCoefficient(ind[j], obj[j]);
1266/** multiplies a row with a non-zero scalar; for negative scalars, the row's sense is switched accordingly */
1337/** multiplies a column with a non-zero scalar; the objective value is multiplied with the scalar, and the bounds
1492 assert((nnonz != NULL && beg != NULL && ind != NULL && val != NULL) || (nnonz == NULL && beg == NULL && ind == NULL && val == NULL));
1499 const double* colLower = clp->getColLower(); // Here we can use the const versions (see SCIPchgBounds)
1556 assert((nnonz != NULL && beg != NULL && ind != NULL && val != NULL) || (nnonz == NULL && beg == NULL && ind == NULL && val == NULL));
1561 const double* rowLower = clp->getRowLower(); // Here we can use the const versions (see SCIPchgSides)
1603 char** colnames, /**< pointers to column names (of size at least lastcol-firstcol+1) or NULL if namestoragesize is zero */
1605 int namestoragesize, /**< size of namestorage (if 0, storageleft returns the storage needed) */
1606 int* storageleft /**< amount of storage left (if < 0 the namestorage was not big enough) or NULL if namestoragesize is zero */
1627 char** rownames, /**< pointers to row names (of size at least lastrow-firstrow+1) or NULL if namestoragesize is zero */
1629 int namestoragesize, /**< size of namestorage (if 0, -storageleft returns the storage needed) */
1630 int* storageleft /**< amount of storage left (if < 0 the namestorage was not big enough) or NULL if namestoragesize is zero */
1646/** tries to reset the internal status of the LP solver in order to ignore an instability of the last solving call */
1658 /* Unstable situations are currently not ignored. Could fix this similar to lpi_cpx by adjusting the solution status. */
1700 const double* obj = lpi->clp->getObjCoefficients(); // Here we can use the const versions (see SCIPchgObj)
1725 const double* colLower = lpi->clp->getColLower(); // Here we can use the const versions (see SCIPchgBounds)
1756 const double* rowLower = lpi->clp->getRowLower(); // Here we can use the const versions (see SCIPchgSides)
1812 SCIPdebugMessage("calling Clp primal(): %d cols, %d rows\n", lpi->clp->numberColumns(), lpi->clp->numberRows());
1887 SCIPdebugMessage("calling Clp dual(): %d cols, %d rows\n", lpi->clp->numberColumns(), lpi->clp->numberRows());
1956/** calls barrier or interior point algorithm to solve the LP with crossover to simplex basis */
1965 SCIPdebugMessage("calling Clp barrier(): %d cols, %d rows; crossover: %u\n", lpi->clp->numberColumns(), lpi->clp->numberRows(), crossover);
2045 SCIPdebugMessage("calling SCIPlpiStrongbranch() on variable %d (%d iterations)\n", col, itlim);
2115 int res = clp->strongBranching(1, &col, up, down, outputSolution, outputStatus, outputIterations, false, true, startFinishOptions);
2166 SCIPdebugMessage("calling SCIPlpiStrongbranches() on %d variables (%d iterations)\n", ncols, itlim);
2248 int res = clp->strongBranching(ncols, cols, up, down, outputSolution, outputStatus, outputIterations, false, true, startFinishOptions);
2323 SCIP_CALL( lpiStrongbranches(lpi, cols, ncols, psols, itlim, down, up, downvalid, upvalid, iter) );
2369 SCIP_CALL( lpiStrongbranches(lpi, cols, ncols, psols, itlim, down, up, downvalid, upvalid, iter) );
2397 * The feasibility information is with respect to the last solving call and it is only relevant if SCIPlpiWasSolved()
2400 * Note that @a primalfeasible and @a dualfeasible should only return true if the solver has proved the respective LP to
2401 * be feasible. Thus, the return values should be equal to the values of SCIPlpiIsPrimalFeasible() and
2402 * SCIPlpiIsDualFeasible(), respectively. Note that if feasibility cannot be proved, they should return false (even if
2447/** returns TRUE iff LP is proven to have a primal unbounded ray (but not necessary a primal feasible point);
2465/** returns TRUE iff LP is proven to have a primal unbounded ray (but not necessary a primal feasible point),
2514 * stop with objective limit exceedence). Hence we are infeasible only if status == 1 and we have
2516 return ( lpi->clp->status() == 1 && (lpi->clp->secondaryStatus() == 0 || lpi->clp->secondaryStatus() == 6) );
2534/** returns TRUE iff LP is proven to have a dual unbounded ray (but not necessary a dual feasible point);
2546 /* Clp usually has a dual ray whenever it concludes "primal infeasible" (but is not necessarily dual feasible), see
2547 * ClpModel::infeasibilityRay. Additionally check whether ray exists in order to avoid situations in which Clp cannot
2548 * provide a ray. SCIP often decides to resolve in such a case and the problem might go away. */
2549 return ( lpi->clp->status() == 1 && lpi->clp->secondaryStatus() == 0 && lpi->clp->rayExists() );
2553/** returns TRUE iff LP is proven to have a dual unbounded ray (but not necessary a dual feasible point),
2565 /* Clp usually has a dual ray whenever it concludes "primal infeasible" (but is not necessarily dual feasible),
2587 /* The dual seems to be unbounded if the status is 1 (primal unbounded), the secondaryStatus is
2590 return ( lpi->clp->status() == 1 && lpi->clp->secondaryStatus() == 0 && lpi->clp->dualFeasible() );
2636 return( lpi->clp->isProvenOptimal() && (lpi->clp->secondaryStatus() == 0 || lpi->clp->secondaryStatus() == 6));
2642 * This function should return true if the solution is reliable, i.e., feasible and optimal (or proven
2643 * infeasible/unbounded) with respect to the original problem. The optimality status might be with respect to a scaled
2644 * version of the problem, but the solution might not be feasible to the unscaled original problem; in this case,
2656 /* Return false if infeasible, but dual ray is not present and the algorithm type has changed. This is one of the
2658 if ( lpi->clp->status() == 1 && lpi->lastalgorithm != lpi->clp->algorithm() && ! lpi->clp->rayExists() )
2671 * 1 - primal infeasible because dual limit reached OR (probably primal infeasible but can't prove it - main status was 4)
2682 SCIPdebugMessage("status: %d secondary: %d\n", lpi->clp->status(), lpi->clp->secondaryStatus());
2685 return( (lpi->clp->status() <= 3) && (lpi->clp->secondaryStatus() <= 1 || lpi->clp->secondaryStatus() == 6 || lpi->clp->secondaryStatus() == 9) );
2711 if ( lpi->clp->status() == 0 || (lpi->clp->status() == 1 && lpi->clp->algorithm() < 0) || (lpi->clp->status() == 2 && lpi->clp->algorithm() > 0) )
2713 return ( lpi->clp->isPrimalObjectiveLimitReached() || lpi->clp->isDualObjectiveLimitReached() );
2785 * Before calling this function, the caller must ensure that the LP has been solved to optimality, i.e., that
2843 /* Unbounded ray (NULL returned if none/wrong). Up to user to use delete [] on these arrays. */
2868 /* Infeasibility ray (NULL returned if none/wrong). Up to user to use delete [] on these arrays. */
2874 /* The dual ray returned by Clp sometimes contains large numbers. We try to scale the vector. First compute maximal
2898 /* We try to make the maximum absolute value to be 1.0, but if the minimal absolute value would be less than the
2899 * feasibility tolerance, we adjust the factor such that it will be equal to the feasibility tolerance. */
2937 * Such information is usually only available, if also a (maybe not optimal) solution is available.
2938 * The LPI should return SCIP_INVALID for @p quality, if the requested quantity is not available.
2966/** gets current basis status for columns and rows; arrays must be large enough to store the basis status */
3188/** returns the indices of the basic columns and rows; basic column n gives value n, basic row m gives value -1-m */
3235 * @note The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver
3236 * uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated;
3270 * @note The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver
3271 * uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated;
3308 * @note The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver
3309 * uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated;
3317 const SCIP_Real* binvrow, /**< row in (A_B)^-1 from prior call to SCIPlpiGetBInvRow(), or NULL */
3343 * @note The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver
3344 * uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated;
3426/** loads LPi state (like basis information) into solver; note that the LP might have been extended with additional
3607/** loads LPi pricing norms into solver; note that the LP might have been extended with additional
3666 if( lpi->clp->scalingFlag() != 0 ) // 0 -off, 1 equilibrium, 2 geometric, 3 auto, 4 dynamic(later)
3754 lpi->clp->scaling((ival > 0) ? 3 : 0); // 0 -off, 1 equilibrium, 2 geometric, 3, auto, 4 dynamic(later));
void SCIPdecodeDualBit(const SCIP_DUALPACKET *inp, int *out, int count)
Definition: bitencode.c:308
void SCIPencodeDualBit(const int *inp, SCIP_DUALPACKET *out, int count)
Definition: bitencode.c:238
packing single and dual bit values
static SCIP_RETCODE lpiStrongbranches(SCIP_LPI *lpi, int *cols, int ncols, SCIP_Real *psols, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
Definition: lpi_clp.cpp:2151
SCIP_RETCODE SCIPlpiChgSides(SCIP_LPI *lpi, int nrows, const int *ind, const SCIP_Real *lhs, const SCIP_Real *rhs)
Definition: lpi_clp.cpp:1167
SCIP_RETCODE SCIPlpiSetState(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, const SCIP_LPISTATE *lpistate)
Definition: lpi_clp.cpp:3429
SCIP_RETCODE SCIPlpiGetBInvACol(SCIP_LPI *lpi, int c, SCIP_Real *coef, int *inds, int *ninds)
Definition: lpi_clp.cpp:3349
SCIP_RETCODE SCIPlpiGetRealpar(SCIP_LPI *lpi, SCIP_LPPARAM type, SCIP_Real *dval)
Definition: lpi_clp.cpp:3796
SCIP_RETCODE SCIPlpiChgObjsen(SCIP_LPI *lpi, SCIP_OBJSEN objsen)
Definition: lpi_clp.cpp:1220
SCIP_Bool SCIPlpiIsInfinity(SCIP_LPI *lpi, SCIP_Real val)
Definition: lpi_clp.cpp:3931
SCIP_RETCODE SCIPlpiGetBase(SCIP_LPI *lpi, int *cstat, int *rstat)
Definition: lpi_clp.cpp:2967
SCIP_RETCODE SCIPlpiReadState(SCIP_LPI *lpi, const char *fname)
Definition: lpi_clp.cpp:3532
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)
Definition: lpi_clp.cpp:914
SCIP_RETCODE SCIPlpiGetPrimalRay(SCIP_LPI *lpi, SCIP_Real *ray)
Definition: lpi_clp.cpp:2832
SCIP_RETCODE SCIPlpiGetIntpar(SCIP_LPI *lpi, SCIP_LPPARAM type, int *ival)
Definition: lpi_clp.cpp:3648
SCIP_RETCODE SCIPlpiWriteLP(SCIP_LPI *lpi, const char *fname)
Definition: lpi_clp.cpp:4001
SCIP_RETCODE SCIPlpiSetIntegralityInformation(SCIP_LPI *lpi, int ncols, int *intInfo)
Definition: lpi_clp.cpp:480
SCIP_RETCODE SCIPlpiSetRealpar(SCIP_LPI *lpi, SCIP_LPPARAM type, SCIP_Real dval)
Definition: lpi_clp.cpp:3833
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)
Definition: lpi_clp.cpp:2283
SCIP_RETCODE SCIPlpiSetNorms(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, const SCIP_LPINORMS *lpinorms)
Definition: lpi_clp.cpp:3610
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)
Definition: lpi_clp.cpp:2329
SCIP_RETCODE SCIPlpiGetBounds(SCIP_LPI *lpi, int firstcol, int lastcol, SCIP_Real *lbs, SCIP_Real *ubs)
Definition: lpi_clp.cpp:1709
SCIP_RETCODE SCIPlpiGetDualfarkas(SCIP_LPI *lpi, SCIP_Real *dualfarkas)
Definition: lpi_clp.cpp:2857
SCIP_RETCODE SCIPlpiGetObjval(SCIP_LPI *lpi, SCIP_Real *objval)
Definition: lpi_clp.cpp:2766
SCIP_RETCODE SCIPlpiScaleCol(SCIP_LPI *lpi, int col, SCIP_Real scaleval)
Definition: lpi_clp.cpp:1340
SCIP_RETCODE SCIPlpiStartStrongbranch(SCIP_LPI *lpi)
Definition: lpi_clp.cpp:2006
SCIP_RETCODE SCIPlpiGetSolFeasibility(SCIP_LPI *lpi, SCIP_Bool *primalfeasible, SCIP_Bool *dualfeasible)
Definition: lpi_clp.cpp:2405
SCIP_RETCODE SCIPlpiFreeNorms(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPINORMS **lpinorms)
Definition: lpi_clp.cpp:3623
SCIP_RETCODE SCIPlpiChgBounds(SCIP_LPI *lpi, int ncols, const int *ind, const SCIP_Real *lb, const SCIP_Real *ub)
Definition: lpi_clp.cpp:1084
SCIP_Bool SCIPlpiIsPrimalUnbounded(SCIP_LPI *lpi)
Definition: lpi_clp.cpp:2488
SCIP_RETCODE SCIPlpiIgnoreInstability(SCIP_LPI *lpi, SCIP_Bool *success)
Definition: lpi_clp.cpp:1647
SCIP_RETCODE SCIPlpiWriteState(SCIP_LPI *lpi, const char *fname)
Definition: lpi_clp.cpp:3552
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)
Definition: lpi_clp.cpp:2304
SCIP_RETCODE SCIPlpiGetCoef(SCIP_LPI *lpi, int row, int col, SCIP_Real *val)
Definition: lpi_clp.cpp:1771
SCIP_RETCODE SCIPlpiReadLP(SCIP_LPI *lpi, const char *fname)
Definition: lpi_clp.cpp:3972
SCIP_RETCODE SCIPlpiGetRealSolQuality(SCIP_LPI *lpi, SCIP_LPSOLQUALITY qualityindicator, SCIP_Real *quality)
Definition: lpi_clp.cpp:2940
static SCIP_RETCODE lpiStrongbranch(SCIP_LPI *lpi, int col, SCIP_Real psol, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
Definition: lpi_clp.cpp:2031
SCIP_RETCODE SCIPlpiGetNorms(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPINORMS **lpinorms)
Definition: lpi_clp.cpp:3592
SCIP_Bool SCIPlpiHasStateBasis(SCIP_LPI *lpi, SCIP_LPISTATE *lpistate)
Definition: lpi_clp.cpp:3522
SCIP_RETCODE SCIPlpiSetIntpar(SCIP_LPI *lpi, SCIP_LPPARAM type, int ival)
Definition: lpi_clp.cpp:3692
SCIP_RETCODE SCIPlpiSetBase(SCIP_LPI *lpi, const int *cstat, const int *rstat)
Definition: lpi_clp.cpp:3067
SCIP_RETCODE SCIPlpiGetBInvRow(SCIP_LPI *lpi, int r, SCIP_Real *coef, int *inds, int *ninds)
Definition: lpi_clp.cpp:3241
SCIP_RETCODE SCIPlpiDelRows(SCIP_LPI *lpi, int firstrow, int lastrow)
Definition: lpi_clp.cpp:986
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)
Definition: lpi_clp.cpp:1474
SCIP_RETCODE SCIPlpiGetBInvCol(SCIP_LPI *lpi, int c, SCIP_Real *coef, int *inds, int *ninds)
Definition: lpi_clp.cpp:3276
SCIP_RETCODE SCIPlpiGetColNames(SCIP_LPI *lpi, int firstcol, int lastcol, char **colnames, char *namestorage, int namestoragesize, int *storageleft)
Definition: lpi_clp.cpp:1599
SCIP_RETCODE SCIPlpiGetBInvARow(SCIP_LPI *lpi, int r, const SCIP_Real *binvrow, SCIP_Real *coef, int *inds, int *ninds)
Definition: lpi_clp.cpp:3314
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)
Definition: lpi_clp.cpp:1538
SCIP_RETCODE SCIPlpiSolveBarrier(SCIP_LPI *lpi, SCIP_Bool crossover)
Definition: lpi_clp.cpp:1957
SCIP_RETCODE SCIPlpiGetRowNames(SCIP_LPI *lpi, int firstrow, int lastrow, char **rownames, char *namestorage, int namestoragesize, int *storageleft)
Definition: lpi_clp.cpp:1623
SCIP_RETCODE SCIPlpiEndStrongbranch(SCIP_LPI *lpi)
Definition: lpi_clp.cpp:2018
SCIP_RETCODE SCIPlpiGetSides(SCIP_LPI *lpi, int firstrow, int lastrow, SCIP_Real *lhss, SCIP_Real *rhss)
Definition: lpi_clp.cpp:1740
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)
Definition: lpi_clp.cpp:2350
SCIP_RETCODE SCIPlpiGetSol(SCIP_LPI *lpi, SCIP_Real *objval, SCIP_Real *primsol, SCIP_Real *dualsol, SCIP_Real *activity, SCIP_Real *redcost)
Definition: lpi_clp.cpp:2788
SCIP_RETCODE SCIPlpiGetObj(SCIP_LPI *lpi, int firstcol, int lastcol, SCIP_Real *vals)
Definition: lpi_clp.cpp:1686
SCIP_RETCODE SCIPlpiFreeState(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPISTATE **lpistate)
Definition: lpi_clp.cpp:3503
SCIP_Bool SCIPlpiIsPrimalInfeasible(SCIP_LPI *lpi)
Definition: lpi_clp.cpp:2502
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)
Definition: lpi_clp.cpp:758
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)
Definition: lpi_clp.cpp:677
SCIP_RETCODE SCIPlpiGetIterations(SCIP_LPI *lpi, int *iterations)
Definition: lpi_clp.cpp:2921
SCIP_RETCODE SCIPlpiGetBasisInd(SCIP_LPI *lpi, int *bind)
Definition: lpi_clp.cpp:3189
SCIP_RETCODE SCIPlpiCreate(SCIP_LPI **lpi, SCIP_MESSAGEHDLR *messagehdlr, const char *name, SCIP_OBJSEN objsen)
Definition: lpi_clp.cpp:531
SCIP_RETCODE SCIPlpiChgObj(SCIP_LPI *lpi, int ncols, const int *ind, const SCIP_Real *obj)
Definition: lpi_clp.cpp:1240
SCIP_RETCODE SCIPlpiGetObjsen(SCIP_LPI *lpi, SCIP_OBJSEN *objsen)
Definition: lpi_clp.cpp:1666
SCIP_RETCODE SCIPlpiInterrupt(SCIP_LPI *lpi, SCIP_Bool interrupt)
Definition: lpi_clp.cpp:3895
SCIP_RETCODE SCIPlpiDelCols(SCIP_LPI *lpi, int firstcol, int lastcol)
Definition: lpi_clp.cpp:837
SCIP_RETCODE SCIPlpiDelRowset(SCIP_LPI *lpi, int *dstat)
Definition: lpi_clp.cpp:1018
SCIP_RETCODE SCIPlpiScaleRow(SCIP_LPI *lpi, int row, SCIP_Real scaleval)
Definition: lpi_clp.cpp:1267
SCIP_RETCODE SCIPlpiGetState(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPISTATE **lpistate)
Definition: lpi_clp.cpp:3389
SCIP_RETCODE SCIPlpiChgCoef(SCIP_LPI *lpi, int row, int col, SCIP_Real newval)
Definition: lpi_clp.cpp:1197
interface methods for specific LP solvers
static void lpistatePack(SCIP_LPISTATE *lpistate, const int *cstat, const int *rstat)
Definition: lpi_clp.cpp:218
static void lpistateUnpack(const SCIP_LPISTATE *lpistate, int *cstat, int *rstat)
Definition: lpi_clp.cpp:234
static void lpistateFree(SCIP_LPISTATE **lpistate, BMS_BLKMEM *blkmem)
Definition: lpi_clp.cpp:271
static void unsetFastmipClpParameters(SCIP_LPI *lpi)
Definition: lpi_clp.cpp:419
static void setFactorizationFrequency(SCIP_LPI *lpi)
Definition: lpi_clp.cpp:305
static void setFastmipClpParameters(SCIP_LPI *lpi)
Definition: lpi_clp.cpp:321
static SCIP_RETCODE lpistateCreate(SCIP_LPISTATE **lpistate, BMS_BLKMEM *blkmem, int ncols, int nrows)
Definition: lpi_clp.cpp:250
public methods for message output
Definition: lpi_cpx.c:199
Definition: lpi_clp.cpp:133
Definition: lpi_clp.cpp:105
Definition: struct_message.h:46