reader_bnd.c File Reference

Detailed Description

file reader for variable bounds

Author

Ambros Gleixner

Ingmar Vierhaus

Benjamin Mueller

This reader allows to read a file containing new bounds for variables of the current problem. Each line of the file should have format

<variable name> <lower bound> <upper bound>

where infinite bounds can be written as inf, +inf or -inf. Note that only a subset of the variables may appear in the file. Lines with unknown variable names are ignored. The writing functionality can be used in problem and transformed stages. Note that in transformed stage, the leading "t_" in the name of a transformed variable will not appear in the output. This way, bounds written in transformed stage can be read again in problem stage.

Definition in file reader_bnd.c.

#include <assert.h>
#include <string.h>
#include <strings.h>
#include "scip/reader_bnd.h"
#include "scip/pub_misc.h"

Go to the source code of this file.

Macros
#define	READER_NAME   "bndreader"
#define	READER_DESC   "file reader for variable bounds"
#define	READER_EXTENSION   "bnd"
#define	DEFAULT_IMPROVEONLY   FALSE

Functions
static SCIP_RETCODE	readBounds (SCIP *scip, const char *fname, SCIP_READERDATA *readerdata)
static	SCIP_DECL_READERCOPY (readerCopyBnd)
static	SCIP_DECL_READERREAD (readerReadBnd)
static void	printBounds (SCIP *scip, SCIP_MESSAGEHDLR *messagehdlr, FILE *file, SCIP_Real lb, SCIP_Real ub)
static SCIP_RETCODE	SCIPwriteBnd (SCIP *scip, FILE *file, SCIP_VAR **vars, int nvars, SCIP_RESULT *result)
static	SCIP_DECL_READERWRITE (readerWriteBnd)
static	SCIP_DECL_READERFREE (readerFreeBnd)
SCIP_RETCODE	SCIPincludeReaderBnd (SCIP *scip)

Macro Definition Documentation

READER_NAME

#define READER_NAME   "bndreader"

Definition at line 46 of file reader_bnd.c.

Referenced by SCIP_DECL_READERCOPY(), SCIP_DECL_READERFREE(), SCIP_DECL_READERREAD(), SCIP_DECL_READERWRITE(), SCIPincludeReaderBnd(), and SCIPincludeReaderZpl().

READER_DESC

#define READER_DESC   "file reader for variable bounds"

Definition at line 47 of file reader_bnd.c.

Referenced by SCIPincludeReaderBnd(), and SCIPincludeReaderZpl().

READER_EXTENSION

#define READER_EXTENSION   "bnd"

Definition at line 48 of file reader_bnd.c.

Referenced by SCIPincludeReaderBnd(), and SCIPincludeReaderZpl().

DEFAULT_IMPROVEONLY

#define DEFAULT_IMPROVEONLY   FALSE

only use improving bounds

Definition at line 50 of file reader_bnd.c.

Referenced by SCIPincludeReaderBnd().

Function Documentation

readBounds()

static SCIP_RETCODE readBounds ( SCIP *  scip, const char *  fname, SCIP_READERDATA *  readerdata  )

static

reads a given bound file, problem has to be in problem stage

Parameters

scip	SCIP data structure
fname	name of the input file
readerdata	pointer to the data of the reader

Definition at line 66 of file reader_bnd.c.

References FALSE, MAX, MIN, NULL, SCIP_Bool, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_NOFILE, SCIP_OKAY, SCIP_READERROR, SCIP_Real, SCIPchgVarLb(), SCIPchgVarUb(), SCIPerrorMessage, SCIPfclose(), SCIPfeof(), SCIPfgets(), SCIPfopen(), SCIPgetBoolParam(), SCIPinfinity(), SCIPisGT(), SCIPisLT(), SCIPparseVarName(), SCIPprintSysError(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetUbGlobal(), SCIPwarningMessage(), and TRUE.

Referenced by SCIP_DECL_READERREAD().

SCIP_DECL_READERCOPY()

static SCIP_DECL_READERCOPY ( readerCopyBnd  )

static

copy method for reader plugins (called when SCIP copies plugins)

Definition at line 227 of file reader_bnd.c.

References NULL, READER_NAME, SCIP_CALL, SCIP_OKAY, SCIPincludeReaderBnd(), and SCIPreaderGetName().

SCIP_DECL_READERREAD()

static SCIP_DECL_READERREAD ( readerReadBnd  )

static

problem reading method of reader

In order to determine the type of the file, we have to open it. Thus, it has to be opened twice. This might be removed, but is likely to not hurt the performance too much.

Definition at line 246 of file reader_bnd.c.

References NULL, readBounds(), READER_NAME, SCIP_CALL, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_READERROR, SCIP_STAGE_PROBLEM, SCIP_SUCCESS, SCIPerrorMessage, SCIPgetStage(), SCIPreaderGetData(), and SCIPreaderGetName().

printBounds()

static void printBounds ( SCIP *  scip, SCIP_MESSAGEHDLR *  messagehdlr, FILE *  file, SCIP_Real  lb, SCIP_Real  ub  )

static

outputs given bounds into a file stream

Parameters

scip	SCIP data structure
messagehdlr	message handler
file	file stream to print into, or NULL for stdout
lb	lower bound
ub	upper bound

Definition at line 276 of file reader_bnd.c.

References SCIP_REAL_FORMAT, SCIPisInfinity(), and SCIPmessageFPrintInfo().

Referenced by SCIPwriteBnd().

SCIPwriteBnd()

static SCIP_RETCODE SCIPwriteBnd ( SCIP *  scip, FILE *  file, SCIP_VAR **  vars, int  nvars, SCIP_RESULT *  result  )

static

writes problem to file

Parameters

scip	SCIP data structure
file	file stream to print into, or NULL for stdout
vars	array with active variables ordered binary, integer, implicit, continuous
nvars	number of active variables in the problem
result	pointer to store the result of the file writing call

Definition at line 303 of file reader_bnd.c.

References NULL, printBounds(), SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIPgetMessagehdlr(), SCIPinfoMessage(), SCIPmessageFPrintInfo(), SCIPvarGetLbGlobal(), SCIPvarGetLbOriginal(), SCIPvarGetName(), SCIPvarGetUbGlobal(), SCIPvarGetUbOriginal(), SCIPvarIsTransformed(), SCIPvarIsTransformedOrigvar(), and SCIPwarningMessage().

Referenced by SCIP_DECL_READERWRITE().

SCIP_DECL_READERWRITE()

static SCIP_DECL_READERWRITE ( readerWriteBnd  )

static

problem writing method of reader

Definition at line 366 of file reader_bnd.c.

References NULL, READER_NAME, SCIP_CALL, SCIP_OKAY, SCIPreaderGetName(), and SCIPwriteBnd().

SCIP_DECL_READERFREE()

static SCIP_DECL_READERFREE ( readerFreeBnd  )

static

destructor of reader to free reader data (called when SCIP is exiting)

Definition at line 378 of file reader_bnd.c.

References NULL, READER_NAME, SCIP_OKAY, SCIPfreeBlockMemory, SCIPreaderGetData(), and SCIPreaderGetName().