SCIP
Solving Constraint Integer Programs
Solving Constraint Integer Programs
dummy interface for the case no LP solver is needed
Definition in file lpi_none.c.
Go to the source code of this file.
Macros | |
| #define | LPINAME "NONE" |
| #define | LPIINFINITY 1e20 |
| #define LPINAME "NONE" |
name of the LPI interface
Definition at line 29 of file lpi_none.c.
Referenced by SCIPlpiGetSolverName().
| #define LPIINFINITY 1e20 |
infinity value
Definition at line 30 of file lpi_none.c.
Referenced by SCIPlpiInfinity(), and SCIPlpiIsInfinity().
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static |
error handling method
Definition at line 50 of file lpi_none.c.
References SCIPABORT, and SCIPerrorMessage.
Referenced by SCIPlpiExistsDualRay(), SCIPlpiExistsPrimalRay(), SCIPlpiGetInternalStatus(), SCIPlpiHasDualRay(), SCIPlpiHasPrimalRay(), SCIPlpiHasStateBasis(), SCIPlpiIsDualFeasible(), SCIPlpiIsDualInfeasible(), SCIPlpiIsDualUnbounded(), SCIPlpiIsIterlimExc(), SCIPlpiIsObjlimExc(), SCIPlpiIsOptimal(), SCIPlpiIsPrimalFeasible(), SCIPlpiIsPrimalInfeasible(), SCIPlpiIsPrimalUnbounded(), SCIPlpiIsStable(), SCIPlpiIsTimelimExc(), and SCIPlpiWasSolved().
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static |
error handling method
Definition at line 61 of file lpi_none.c.
References SCIPerrorMessage.
Referenced by SCIPlpiFreeNorms(), SCIPlpiGetBase(), SCIPlpiGetBasisInd(), SCIPlpiGetBInvACol(), SCIPlpiGetBInvARow(), SCIPlpiGetBInvCol(), SCIPlpiGetBInvRow(), SCIPlpiGetBounds(), SCIPlpiGetCoef(), SCIPlpiGetColNames(), SCIPlpiGetCols(), SCIPlpiGetDualfarkas(), SCIPlpiGetIterations(), SCIPlpiGetNNonz(), SCIPlpiGetNorms(), SCIPlpiGetObj(), SCIPlpiGetObjsen(), SCIPlpiGetObjval(), SCIPlpiGetPrimalRay(), SCIPlpiGetRowNames(), SCIPlpiGetRows(), SCIPlpiGetSides(), SCIPlpiGetSol(), SCIPlpiGetSolFeasibility(), SCIPlpiGetState(), SCIPlpiIgnoreInstability(), SCIPlpiReadLP(), SCIPlpiReadState(), SCIPlpiSetBase(), SCIPlpiSetNorms(), SCIPlpiSetState(), SCIPlpiSolveBarrier(), SCIPlpiSolveDual(), SCIPlpiSolvePrimal(), SCIPlpiStrongbranchesFrac(), SCIPlpiStrongbranchesInt(), SCIPlpiStrongbranchFrac(), SCIPlpiStrongbranchInt(), SCIPlpiWriteLP(), and SCIPlpiWriteState().
| const char* SCIPlpiGetSolverName | ( | void | ) |
| const char* SCIPlpiGetSolverDesc | ( | void | ) |
gets description of LP solver (developer, webpage, ...)
Definition at line 90 of file lpi_none.c.
| 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 98 of file lpi_none.c.
References NULL.
| 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 106 of file lpi_none.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 129 of file lpi_none.c.
References BMSallocMemory, NULL, SCIP_ALLOC, SCIP_OKAY, and SCIPdebugMessage.
| SCIP_RETCODE SCIPlpiFree | ( | SCIP_LPI ** | lpi | ) |
deletes an LP problem object
| lpi | pointer to an LP interface structure |
Definition at line 149 of file lpi_none.c.
References BMSfreeMemory, 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 174 of file lpi_none.c.
References SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, and SCIP_OKAY.
| 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 203 of file lpi_none.c.
References SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, and SCIP_OKAY.
| 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 242 of file lpi_none.c.
References SCIP_LPi::ncols, NULL, and SCIP_OKAY.
| 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 258 of file lpi_none.c.
References SCIP_LPi::ncols, NULL, and SCIP_OKAY.
| 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 289 of file lpi_none.c.
References SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, and SCIP_OKAY.
| 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 319 of file lpi_none.c.
References SCIP_LPi::nrows, NULL, and SCIP_OKAY.
| 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 335 of file lpi_none.c.
References SCIP_LPi::nrows, NULL, and SCIP_OKAY.
| SCIP_RETCODE SCIPlpiClear | ( | SCIP_LPI * | lpi | ) |
clears the whole LP
| lpi | LP interface structure |
Definition at line 366 of file lpi_none.c.
References SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, and SCIP_OKAY.
| 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 381 of file lpi_none.c.
References SCIP_LPi::ncols, NULL, SCIP_LPERROR, SCIP_OKAY, SCIPerrorMessage, and SCIPlpiIsInfinity().
| 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 411 of file lpi_none.c.
References SCIP_OKAY.
| 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 423 of file lpi_none.c.
References SCIP_OKAY.
| SCIP_RETCODE SCIPlpiChgObjsen | ( | SCIP_LPI * | lpi, |
| SCIP_OBJSEN | objsen | ||
| ) |
changes the objective sense
| lpi | LP interface structure |
| objsen | new objective sense |
Definition at line 434 of file lpi_none.c.
References SCIP_OKAY.
| 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 443 of file lpi_none.c.
References SCIP_OKAY.
| 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 454 of file lpi_none.c.
References SCIP_OKAY.
| 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 466 of file lpi_none.c.
References SCIP_OKAY.
| 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 488 of file lpi_none.c.
References SCIP_LPi::nrows, NULL, and SCIP_OKAY.
| 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 503 of file lpi_none.c.
References SCIP_LPi::ncols, NULL, and SCIP_OKAY.
| 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 518 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 532 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 552 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 569 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 584 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 599 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 609 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 bounds for |
| lastcol | last column to get bounds for |
| lbs | array to store lower bound values, or NULL |
| ubs | array to store upper bound values, or NULL |
Definition at line 621 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 634 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 648 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 672 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 681 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 690 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| SCIP_RETCODE SCIPlpiStartStrongbranch | ( | SCIP_LPI * | lpi | ) |
start strong branching - call before any strong branching
| lpi | LP interface structure |
Definition at line 700 of file lpi_none.c.
| SCIP_RETCODE SCIPlpiEndStrongbranch | ( | SCIP_LPI * | lpi | ) |
end strong branching - call after any strong branching
| lpi | LP interface structure |
Definition at line 709 of file lpi_none.c.
| 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 718 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 741 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 767 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 790 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
returns whether a solve method was called after the last modification of the LP
| lpi | LP interface structure |
Definition at line 827 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
| 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 836 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
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 851 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
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 862 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff LP is proven to be primal unbounded
| lpi | LP interface structure |
Definition at line 871 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff LP is proven to be primal infeasible
| lpi | LP interface structure |
Definition at line 880 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff LP is proven to be primal feasible
| lpi | LP interface structure |
Definition at line 889 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
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 900 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
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 911 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff LP is proven to be dual unbounded
| lpi | LP interface structure |
Definition at line 920 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff LP is proven to be dual infeasible
| lpi | LP interface structure |
Definition at line 929 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff LP is proven to be dual feasible
| lpi | LP interface structure |
Definition at line 938 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff LP was solved to optimality
| lpi | LP interface structure |
Definition at line 947 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff current LP basis is stable
| lpi | LP interface structure |
Definition at line 956 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff the objective limit was reached
| lpi | LP interface structure |
Definition at line 965 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff the iteration limit was reached
| lpi | LP interface structure |
Definition at line 974 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
returns TRUE iff the time limit was reached
| lpi | LP interface structure |
Definition at line 983 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
| int SCIPlpiGetInternalStatus | ( | SCIP_LPI * | lpi | ) |
returns the internal solution status of the solver
| lpi | LP interface structure |
Definition at line 992 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
| 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 1001 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 1012 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 1023 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1037 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1047 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 1058 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 1073 of file lpi_none.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 1100 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1111 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 1124 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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, or NULL |
| ninds | pointer to store the number of non-zero indices, or NULL (-1: if we do not store sparsity informations) |
Definition at line 1139 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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, or NULL |
| ninds | pointer to store the number of non-zero indices, or NULL (-1: if we do not store sparsity informations) |
Definition at line 1158 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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, or NULL |
| ninds | pointer to store the number of non-zero indices, or NULL (-1: if we do not store sparsity informations) |
Definition at line 1181 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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, or NULL |
| ninds | pointer to store the number of non-zero indices, or NULL (-1: if we do not store sparsity informations) |
Definition at line 1201 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1227 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| 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 1242 of file lpi_none.c.
References errorMessage(), NULL, and SCIP_PLUGINNOTFOUND.
| SCIP_RETCODE SCIPlpiClearState | ( | SCIP_LPI * | lpi | ) |
clears current LPi state (like basis information) of the solver
| lpi | LP interface structure |
Definition at line 1254 of file lpi_none.c.
| 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 1263 of file lpi_none.c.
References SCIP_OKAY.
| 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 1273 of file lpi_none.c.
References errorMessageAbort(), and FALSE.
| 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 1283 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1293 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1317 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1330 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1341 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1364 of file lpi_none.c.
References NULL, and SCIP_PARAMETERUNKNOWN.
| 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 1375 of file lpi_none.c.
References SCIP_PARAMETERUNKNOWN.
| 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 1385 of file lpi_none.c.
References NULL, and SCIP_PARAMETERUNKNOWN.
| 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 1396 of file lpi_none.c.
References SCIP_PARAMETERUNKNOWN.
returns value treated as infinity in the LP solver
| lpi | LP interface structure |
Definition at line 1415 of file lpi_none.c.
References LPIINFINITY.
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 1423 of file lpi_none.c.
References FALSE, LPIINFINITY, and TRUE.
Referenced by SCIPlpiChgBounds().
| 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 1446 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.
| 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 1456 of file lpi_none.c.
References errorMessage(), and SCIP_PLUGINNOTFOUND.