reader_lp.h File Reference

Detailed Description

LP file reader.

Author

Tobias Achterberg

This reader allows to parse and write CPLEX .lp files with linear and quadratic constraints and objective, special ordered sets of type 1 and 2, indicators on linear constraints, and semicontinuous variables. For writing, linear (general and specialized), indicator, quadratic, second order cone, and special ordered set constraints are supported.

The lp format is defined within the CPLEX documentation.

Definition in file reader_lp.h.

#include "scip/scip.h"

Go to the source code of this file.

Functions
SCIP_RETCODE	SCIPincludeReaderLp (SCIP *scip)
SCIP_RETCODE	SCIPreadLp (SCIP *scip, SCIP_READER *reader, const char *filename, SCIP_RESULT *result)
SCIP_RETCODE	SCIPwriteLp (SCIP *scip, FILE *file, const char *name, SCIP_Bool transformed, SCIP_OBJSENSE objsense, SCIP_Real objscale, SCIP_Real objoffset, SCIP_VAR **vars, int nvars, int nbinvars, int nintvars, int nimplvars, int ncontvars, SCIP_CONS **conss, int nconss, SCIP_RESULT *result)

Function Documentation

SCIP_RETCODE SCIPincludeReaderLp

(

SCIP *

scip

)

includes the lp file reader into SCIP

Parameters

scip	SCIP data structure

SCIP_RETCODE SCIPreadLp	(	SCIP *	scip,
		SCIP_READER *	reader,
		const char *	filename,
		SCIP_RESULT *	result
	)

reads problem from file

Parameters

scip	SCIP data structure
reader	the file reader itself
filename	full path and name of file to read, or NULL if stdin should be used
result	pointer to store the result of the file reading call

SCIP_RETCODE SCIPwriteLp	(	SCIP *	scip,
		FILE *	file,
		const char *	name,
		SCIP_Bool	transformed,
		SCIP_OBJSENSE	objsense,
		SCIP_Real	objscale,
		SCIP_Real	objoffset,
		SCIP_VAR **	vars,
		int	nvars,
		int	nbinvars,
		int	nintvars,
		int	nimplvars,
		int	ncontvars,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_RESULT *	result
	)

writes problem to file

Parameters

scip	SCIP data structure
file	output file, or NULL if standard output should be used
name	problem name
transformed	TRUE iff problem is the transformed problem
objsense	objective sense
objscale	scalar applied to objective function; external objective value is extobj = objsense * objscale * (intobj + objoffset)
objoffset	objective offset from bound shifting and fixing
vars	array with active variables ordered binary, integer, implicit, continuous
nvars	number of active variables in the problem
nbinvars	number of binary variables
nintvars	number of general integer variables
nimplvars	number of implicit integer variables
ncontvars	number of continuous variables
conss	array with constraints of the problem
nconss	number of constraints in the problem
result	pointer to store the result of the file writing call