Detailed Description

LP file reader.

Author: Tobias Achterberg; Marc Pfetsch; Stefan Heinz; Stefan Vigerske; Michael Winkler; Lars Schewe

Definition in file reader_lp.c.

#include "blockmemshell/memory.h"
#include <ctype.h>
#include "scip/cons_and.h"
#include "scip/cons_bounddisjunction.h"
#include "scip/cons_indicator.h"
#include "scip/cons_knapsack.h"
#include "scip/cons_linear.h"
#include "scip/cons_logicor.h"
#include "scip/cons_quadratic.h"
#include "scip/cons_setppc.h"
#include "scip/cons_soc.h"
#include "scip/cons_sos1.h"
#include "scip/cons_sos2.h"
#include "scip/cons_varbound.h"
#include "scip/pub_cons.h"
#include "scip/pub_fileio.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_reader.h"
#include "scip/pub_var.h"
#include "scip/reader_lp.h"
#include "scip/scip_cons.h"
#include "scip/scip_mem.h"
#include "scip/scip_message.h"
#include "scip/scip_numerics.h"
#include "scip/scip_param.h"
#include "scip/scip_prob.h"
#include "scip/scip_reader.h"
#include "scip/scip_var.h"
#include <stdlib.h>
#include <string.h>
#include <strings.h>

Go to the source code of this file.

Macros
#define	READER_NAME "lpreader"

#define	READER_DESC "file reader for MIPs in IBM CPLEX's LP file format"

#define	READER_EXTENSION "lp"

#define	DEFAULT_LINEARIZE_ANDS TRUE

#define	DEFAULT_AGGRLINEARIZATION_ANDS TRUE

#define	LP_MAX_LINELEN 65536

#define	LP_MAX_PUSHEDTOKENS 2

#define	LP_INIT_COEFSSIZE 8192

#define	LP_INIT_QUADCOEFSSIZE 16

#define	LP_MAX_PRINTLEN 561

#define	LP_MAX_NAMELEN 256

#define	LP_PRINTLEN 100

Typedefs
typedef enum LpSection	LPSECTION

typedef enum LpExpType	LPEXPTYPE

typedef enum LpSense	LPSENSE

typedef struct LpInput	LPINPUT

Enumerations
enum	LpSection { LP_START, LP_OBJECTIVE, LP_END, LP_START, LP_OBJECTIVE, LP_CONSTRAINTS, LP_BOUNDS, LP_GENERALS, LP_BINARIES, LP_SEMICONTINUOUS, LP_SOS, LP_END }

enum	LpExpType { LP_EXP_NONE, LP_EXP_UNSIGNED, LP_EXP_SIGNED, LP_EXP_NONE, LP_EXP_UNSIGNED, LP_EXP_SIGNED }

enum	LpSense { LP_SENSE_LE, LP_SENSE_GE, LP_SENSE_EQ, LP_SENSE_NOTHING, LP_SENSE_LE, LP_SENSE_GE, LP_SENSE_EQ }

Functions
static void	syntaxError (SCIP scip, LPINPUT lpinput, const char *msg)

static SCIP_Bool	hasError (LPINPUT *lpinput)

static SCIP_Bool	isDelimChar (char c)

static SCIP_Bool	isTokenChar (char c)

static SCIP_Bool	isValueChar (char c, char nextc, SCIP_Bool firstchar, SCIP_Bool hasdot, LPEXPTYPE exptype)

static SCIP_Bool	getNextLine (SCIP scip, LPINPUT lpinput)

static void	swapPointers (char pointer1, char pointer2)

static SCIP_Bool	getNextToken (SCIP scip, LPINPUT lpinput)

static void	pushToken (LPINPUT *lpinput)

static void	pushBufferToken (LPINPUT *lpinput)

static void	swapTokenBuffer (LPINPUT *lpinput)

static SCIP_Bool	isNewSection (SCIP scip, LPINPUT lpinput)

static SCIP_Bool	isSign (LPINPUT lpinput, int sign)

static SCIP_Bool	isValue (SCIP scip, LPINPUT lpinput, SCIP_Real *value)

static SCIP_Bool	isSense (LPINPUT lpinput, LPSENSE sense)

static SCIP_RETCODE	getVariable (SCIP scip, char name, SCIP_VAR *var, SCIP_Bool created)

static SCIP_RETCODE	readStart (SCIP scip, LPINPUT lpinput)

static SCIP_RETCODE	readCoefficients (SCIP scip, LPINPUT lpinput, SCIP_Bool isobjective, char name, int coefssize, SCIP_VAR *vars, SCIP_Real coefs, int ncoefs, int quadcoefssize, SCIP_VAR *quadvars1, SCIP_VAR quadvars2, SCIP_Real quadcoefs, int nquadcoefs, SCIP_Real objoffset, SCIP_Bool newsection)

static SCIP_RETCODE	readObjective (SCIP scip, LPINPUT lpinput)

static SCIP_RETCODE	createIndicatorConstraint (SCIP scip, LPINPUT lpinput, const char name, SCIP_VAR binvar, SCIP_Real binvalue)

static SCIP_RETCODE	readConstraints (SCIP scip, LPINPUT lpinput)

static SCIP_RETCODE	readBounds (SCIP scip, LPINPUT lpinput)

static SCIP_RETCODE	readGenerals (SCIP scip, LPINPUT lpinput)

static SCIP_RETCODE	readBinaries (SCIP scip, LPINPUT lpinput)

static SCIP_RETCODE	readSemicontinuous (SCIP scip, LPINPUT lpinput)

static SCIP_RETCODE	readSos (SCIP scip, LPINPUT lpinput)

static SCIP_RETCODE	readLPFile (SCIP scip, LPINPUT lpinput, const char *filename)

static	SCIP_DECL_HASHGETKEY (hashGetKeyVar)

static	SCIP_DECL_HASHKEYEQ (hashKeyEqVar)

static	SCIP_DECL_HASHKEYVAL (hashKeyValVar)

static SCIP_RETCODE	getActiveVariables (SCIP scip, SCIP_VAR vars, SCIP_Real scalars, int nvars, SCIP_Real constant, SCIP_Bool transformed)

static void	clearLine (char linebuffer, int linecnt)

static void	endLine (SCIP scip, FILE file, char linebuffer, int linecnt)

static void	appendLine (SCIP scip, FILE file, char linebuffer, int linecnt, const char *extension)

static void	printRow (SCIP scip, FILE file, const char rowname, const char rownameextension, const char type, SCIP_VAR linvars, SCIP_Real linvals, int nlinvars, SCIP_QUADVARTERM quadvarterms, int nquadvarterms, SCIP_BILINTERM bilinterms, int nbilinterms, SCIP_Real rhs)

static SCIP_RETCODE	printQuadraticCons (SCIP scip, FILE file, const char rowname, SCIP_VAR linvars, SCIP_Real linvals, int nlinvars, SCIP_QUADVARTERM quadvarterms, int nquadvarterms, SCIP_BILINTERM bilinterms, int nbilinterms, SCIP_Real lhs, SCIP_Real rhs, SCIP_Bool transformed)

static void	printSosCons (SCIP scip, FILE file, const char rowname, SCIP_VAR vars, SCIP_Real weights, int nvars, int type)

static SCIP_RETCODE	printSOCCons (SCIP scip, FILE file, const char rowname, SCIP_CONS cons)

static SCIP_RETCODE	printAndCons (SCIP scip, FILE file, const char consname, SCIP_CONS cons, SCIP_Bool aggrlinearizationands, SCIP_Bool transformed)

static SCIP_RETCODE	collectAggregatedVars (SCIP scip, SCIP_VAR vars, int nvars, SCIP_VAR *aggvars, int naggvars, int saggvars, SCIP_HASHTABLE varAggregated)

static SCIP_RETCODE	printAggregatedCons (SCIP scip, FILE file, SCIP_Bool transformed, int nvars, int nAggregatedVars, SCIP_VAR **aggregatedVars)

static void	checkVarnames (SCIP scip, SCIP_VAR *vars, int nvars)

static void	checkConsnames (SCIP scip, SCIP_CONS *conss, int nconss, SCIP_Bool transformed)

static	SCIP_DECL_READERCOPY (readerCopyLp)

static	SCIP_DECL_READERFREE (readerFreeLp)

static	SCIP_DECL_READERREAD (readerReadLp)

static	SCIP_DECL_READERWRITE (readerWriteLp)

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)

Variables
static const char	commentchars [] = "\\"

Macro Definition Documentation

◆ READER_NAME

#define READER_NAME "lpreader"

Definition at line 68 of file reader_lp.c.

Referenced by SCIP_DECL_READERCOPY(), SCIP_DECL_READERFREE(), SCIP_DECL_READERWRITE(), SCIPincludeReaderLp(), and SCIPwriteLp().

◆ READER_DESC

#define READER_DESC "file reader for MIPs in IBM CPLEX's LP file format"

Definition at line 69 of file reader_lp.c.

Referenced by SCIPincludeReaderLp().

◆ READER_EXTENSION

#define READER_EXTENSION "lp"

Definition at line 70 of file reader_lp.c.

Referenced by SCIPincludeReaderLp().

◆ DEFAULT_LINEARIZE_ANDS

#define DEFAULT_LINEARIZE_ANDS TRUE

Should possible "and"-constraints be linearized when writing the lp file?

Definition at line 72 of file reader_lp.c.

Referenced by SCIPincludeReaderLp(), and SCIPwriteLp().

◆ DEFAULT_AGGRLINEARIZATION_ANDS

#define DEFAULT_AGGRLINEARIZATION_ANDS TRUE

Should an aggregated linearization for and constraints be used?

Definition at line 73 of file reader_lp.c.

Referenced by SCIPincludeReaderLp(), and SCIPwriteLp().

◆ LP_MAX_LINELEN

#define LP_MAX_LINELEN 65536

Definition at line 79 of file reader_lp.c.

Referenced by createIndicatorConstraint(), getNextLine(), getNextToken(), isNewSection(), readCoefficients(), readConstraints(), readObjective(), and SCIPreadLp().

◆ LP_MAX_PUSHEDTOKENS

#define LP_MAX_PUSHEDTOKENS 2

Definition at line 80 of file reader_lp.c.

Referenced by pushBufferToken(), pushToken(), and SCIPreadLp().

◆ LP_INIT_COEFSSIZE

#define LP_INIT_COEFSSIZE 8192

Definition at line 81 of file reader_lp.c.

Referenced by readCoefficients().

◆ LP_INIT_QUADCOEFSSIZE

#define LP_INIT_QUADCOEFSSIZE 16

Definition at line 82 of file reader_lp.c.

Referenced by readCoefficients().

◆ LP_MAX_PRINTLEN

#define LP_MAX_PRINTLEN 561

the maximum length of any line is 560 + '\0' = 561

Definition at line 83 of file reader_lp.c.

Referenced by appendLine(), endLine(), printRow(), printSOCCons(), printSosCons(), and SCIPwriteLp().

◆ LP_MAX_NAMELEN

#define LP_MAX_NAMELEN 256

the maximum length for any name is 255 + '\0' = 256

Definition at line 84 of file reader_lp.c.

Referenced by checkConsnames(), checkVarnames(), printAggregatedCons(), printAndCons(), printRow(), printSOCCons(), printSosCons(), and SCIPwriteLp().

◆ LP_PRINTLEN

#define LP_PRINTLEN 100

Definition at line 85 of file reader_lp.c.

Referenced by appendLine().

Typedef Documentation

◆ LPSECTION

typedef enum LpSection LPSECTION

Definition at line 101 of file reader_lp.c.

◆ LPEXPTYPE

typedef enum LpExpType LPEXPTYPE

Definition at line 107 of file reader_lp.c.

◆ LPSENSE

typedef enum LpSense LPSENSE

Definition at line 113 of file reader_lp.c.

◆ LPINPUT

typedef struct LpInput LPINPUT

Definition at line 140 of file reader_lp.c.

Enumeration Type Documentation

◆ LpSection

enum LpSection

Section in LP File

Enumerator
LP_START
LP_OBJECTIVE
LP_END
LP_START
LP_OBJECTIVE
LP_CONSTRAINTS
LP_BOUNDS
LP_GENERALS
LP_BINARIES
LP_SEMICONTINUOUS
LP_SOS
LP_END

Definition at line 97 of file reader_lp.c.

◆ LpExpType

enum LpExpType

Enumerator
LP_EXP_NONE
LP_EXP_UNSIGNED
LP_EXP_SIGNED
LP_EXP_NONE
LP_EXP_UNSIGNED
LP_EXP_SIGNED

Definition at line 103 of file reader_lp.c.

◆ LpSense

enum LpSense

Enumerator
LP_SENSE_LE
LP_SENSE_GE
LP_SENSE_EQ
LP_SENSE_NOTHING
LP_SENSE_LE
LP_SENSE_GE
LP_SENSE_EQ

Definition at line 109 of file reader_lp.c.

Function Documentation

◆ syntaxError()

static void syntaxError	(	SCIP *	scip,
		LPINPUT *	lpinput,
		const char *	msg
	)

static

issues an error message and marks the LP data to have errors

Parameters

scip	SCIP data structure
lpinput	LP reading data
msg	error message

Definition at line 151 of file reader_lp.c.

References LP_END, NULL, SCIP_VERBLEVEL_MINIMAL, SCIPerrorMessage, SCIPsnprintf(), SCIPverbMessage(), and TRUE.

Referenced by createIndicatorConstraint(), readBinaries(), readBounds(), readCoefficients(), readConstraints(), readGenerals(), readSemicontinuous(), and readSos().

◆ hasError()

static SCIP_Bool hasError ( LPINPUT * lpinput )

static

returns whether a syntax error was detected

Parameters

lpinput LP reading data

Definition at line 178 of file reader_lp.c.

References NULL.

Referenced by createIndicatorConstraint(), readConstraints(), readLPFile(), and readObjective().

◆ isDelimChar()

static SCIP_Bool isDelimChar ( char c )

static

returns whether the given character is a token delimiter

Parameters

c	input character

Definition at line 189 of file reader_lp.c.

References FALSE, and TRUE.

Referenced by getNextToken().

◆ isTokenChar()

static SCIP_Bool isTokenChar ( char c )

static

returns whether the given character is a single token

Parameters

c	input character

Definition at line 210 of file reader_lp.c.

References FALSE, and TRUE.

Referenced by getNextToken().

◆ isValueChar()

static SCIP_Bool isValueChar	(	char	c,
		char	nextc,
		SCIP_Bool	firstchar,
		SCIP_Bool *	hasdot,
		LPEXPTYPE *	exptype
	)

static

returns whether the current character is member of a value string

Parameters

c	input character
nextc	next input character
firstchar	is the given character the first char of the token?
hasdot	pointer to update the dot flag
exptype	pointer to update the exponent type

Definition at line 234 of file reader_lp.c.

References FALSE, LP_EXP_NONE, LP_EXP_SIGNED, LP_EXP_UNSIGNED, NULL, and TRUE.

Referenced by getNextToken().

◆ getNextLine()

static SCIP_Bool getNextLine	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the next line from the input file into the line buffer; skips comments; returns whether a line could be read

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 278 of file reader_lp.c.

References BMSclearMemoryArray, commentchars, FALSE, LP_MAX_LINELEN, NULL, SCIPdebugMsg, SCIPfgets(), SCIPfseek(), SCIPwarningMessage(), and TRUE.

Referenced by getNextToken().

◆ swapPointers()

static void swapPointers	(	char **	pointer1,
		char **	pointer2
	)

static

swaps the addresses of two pointers

Parameters

pointer1	first pointer
pointer2	second pointer

Definition at line 369 of file reader_lp.c.

Referenced by getNextToken(), pushBufferToken(), pushToken(), and swapTokenBuffer().

◆ getNextToken()

static SCIP_Bool getNextToken	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the next token from the input file into the token buffer; returns whether a token was read

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 383 of file reader_lp.c.

References FALSE, getNextLine(), isDelimChar(), isTokenChar(), isValueChar(), LP_END, LP_EXP_NONE, LP_MAX_LINELEN, NULL, SCIP_Bool, SCIPdebugMsg, swapPointers(), and TRUE.

Referenced by createIndicatorConstraint(), isNewSection(), readBinaries(), readBounds(), readCoefficients(), readConstraints(), readGenerals(), readSemicontinuous(), readSos(), and readStart().

◆ pushToken()

static void pushToken ( LPINPUT * lpinput )

static

puts the current token on the token stack, such that it is read at the next call to getNextToken()

Parameters

lpinput LP reading data

Definition at line 488 of file reader_lp.c.

References LP_MAX_PUSHEDTOKENS, NULL, and swapPointers().

Referenced by isNewSection(), readBounds(), readCoefficients(), readConstraints(), readSemicontinuous(), and readSos().

◆ pushBufferToken()

static void pushBufferToken ( LPINPUT * lpinput )

static

puts the buffered token on the token stack, such that it is read at the next call to getNextToken()

Parameters

lpinput LP reading data

Definition at line 501 of file reader_lp.c.

References LP_MAX_PUSHEDTOKENS, NULL, and swapPointers().

Referenced by readCoefficients(), readConstraints(), and readSos().

◆ swapTokenBuffer()

static void swapTokenBuffer ( LPINPUT * lpinput )

static

swaps the current token with the token buffer

Parameters

lpinput LP reading data

Definition at line 514 of file reader_lp.c.

References NULL, and swapPointers().

Referenced by isNewSection(), readCoefficients(), readConstraints(), and readSos().

◆ isNewSection()

static SCIP_Bool isNewSection	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

checks whether the current token is a section identifier, and if yes, switches to the corresponding section

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 525 of file reader_lp.c.

References FALSE, getNextToken(), LP_BINARIES, LP_BOUNDS, LP_CONSTRAINTS, LP_END, LP_GENERALS, LP_MAX_LINELEN, LP_OBJECTIVE, LP_SEMICONTINUOUS, LP_SOS, NULL, pushToken(), SCIP_Bool, SCIP_OBJSENSE_MAXIMIZE, SCIP_OBJSENSE_MINIMIZE, SCIPdebugMsg, swapTokenBuffer(), and TRUE.

Referenced by readBinaries(), readBounds(), readCoefficients(), readConstraints(), readGenerals(), readSemicontinuous(), readSos(), and readStart().

◆ isSign()

static SCIP_Bool isSign	(	LPINPUT *	lpinput,
		int *	sign
	)

static

returns whether the current token is a sign

Parameters

lpinput	LP reading data
sign	pointer to update the sign

Definition at line 736 of file reader_lp.c.

References FALSE, NULL, and TRUE.

Referenced by createIndicatorConstraint(), readBounds(), readCoefficients(), readConstraints(), and readSos().

◆ isValue()

static SCIP_Bool isValue	(	SCIP *	scip,
		LPINPUT *	lpinput,
		SCIP_Real *	value
	)

static

returns whether the current token is a value

Parameters

scip	SCIP data structure
lpinput	LP reading data
value	pointer to store the value (unchanged, if token is no value)

Definition at line 761 of file reader_lp.c.

References FALSE, NULL, SCIPinfinity(), and TRUE.

Referenced by createIndicatorConstraint(), readBounds(), readCoefficients(), readConstraints(), and readSos().

◆ isSense()

static SCIP_Bool isSense	(	LPINPUT *	lpinput,
		LPSENSE *	sense
	)

static

returns whether the current token is an equation sense

Parameters

lpinput	LP reading data
sense	pointer to store the equation sense, or NULL

Definition at line 793 of file reader_lp.c.

References FALSE, LP_SENSE_EQ, LP_SENSE_GE, LP_SENSE_LE, NULL, and TRUE.

Referenced by createIndicatorConstraint(), readBounds(), readCoefficients(), and readConstraints().

◆ getVariable()

static SCIP_RETCODE getVariable	(	SCIP *	scip,
		char *	name,
		SCIP_VAR **	var,
		SCIP_Bool *	created
	)

static

returns the variable with the given name, or creates a new variable if it does not exist

Parameters

scip	SCIP data structure
name	name of the variable
var	pointer to store the variable
created	pointer to store whether a new variable was created, or NULL

Definition at line 824 of file reader_lp.c.

References FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_VARTYPE_CONTINUOUS, SCIPaddVar(), SCIPcreateVar(), SCIPdebugMsg, SCIPfindVar(), SCIPgetBoolParam(), SCIPinfinity(), SCIPreleaseVar(), and TRUE.

Referenced by readBinaries(), readBounds(), readCoefficients(), readGenerals(), and readSemicontinuous().

◆ readStart()

static SCIP_RETCODE readStart	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the header of the file

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 869 of file reader_lp.c.

References getNextToken(), isNewSection(), NULL, and SCIP_OKAY.

Referenced by readLPFile().

◆ readCoefficients()

static SCIP_RETCODE readCoefficients	(	SCIP *	scip,
		LPINPUT *	lpinput,
		SCIP_Bool	isobjective,
		char *	name,
		int *	coefssize,
		SCIP_VAR ***	vars,
		SCIP_Real **	coefs,
		int *	ncoefs,
		int *	quadcoefssize,
		SCIP_VAR ***	quadvars1,
		SCIP_VAR ***	quadvars2,
		SCIP_Real **	quadcoefs,
		int *	nquadcoefs,
		SCIP_Real *	objoffset,
		SCIP_Bool *	newsection
	)

static

reads an objective or constraint with name and coefficients

Parameters

scip	SCIP data structure
lpinput	LP reading data
isobjective	indicates whether we are currently reading the coefficients of the objective
name	pointer to store the name of the line; must be at least of size LP_MAX_LINELEN
coefssize	size of vars and coefs arrays
vars	pointer to store the array with variables (must be freed by caller)
coefs	pointer to store the array with coefficients (must be freed by caller)
ncoefs	pointer to store the number of coefficients
quadcoefssize	size of quadvars1, quadvars2, quadcoefs arrays
quadvars1	pointer to store the array with first variables in quadratic terms (must be freed by caller)
quadvars2	pointer to store the array with second variables in quadratic terms (must be freed by caller)
quadcoefs	pointer to store the array with coefficients in quadratic terms (must be freed by caller)
nquadcoefs	pointer to store the number of quadratic coefficients
objoffset	pointer to store an objective offset (or NULL if ! isobjective)
newsection	pointer to store whether a new section was encountered

Definition at line 890 of file reader_lp.c.

References FALSE, getNextToken(), getVariable(), isNewSection(), isSense(), isSign(), isValue(), LP_INIT_COEFSSIZE, LP_INIT_QUADCOEFSSIZE, LP_MAX_LINELEN, MAX, NULL, pushBufferToken(), pushToken(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBlockMemoryArray, SCIPdebugMsg, SCIPisZero(), SCIPmemccpy(), SCIPreallocBlockMemoryArray, SCIPvarGetName(), SCIPwarningMessage(), swapTokenBuffer(), syntaxError(), and TRUE.

Referenced by createIndicatorConstraint(), readConstraints(), and readObjective().

◆ readObjective()

static SCIP_RETCODE readObjective	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the objective section

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 1293 of file reader_lp.c.

References FALSE, hasError(), LP_MAX_LINELEN, NULL, readCoefficients(), SCIP_Bool, SCIP_CALL, SCIP_OBJSENSE_MINIMIZE, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_CONTINUOUS, SCIPaddCons(), SCIPaddOrigObjoffset(), SCIPaddVar(), SCIPchgVarObj(), SCIPconsGetName(), SCIPcreateConsQuadratic(), SCIPcreateVar(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPfreeBlockMemoryArrayNull, SCIPinfinity(), SCIPisZero(), SCIPreleaseCons(), SCIPreleaseVar(), SCIPvarGetObj(), and TRUE.

Referenced by readLPFile().

◆ createIndicatorConstraint()

static SCIP_RETCODE createIndicatorConstraint	(	SCIP *	scip,
		LPINPUT *	lpinput,
		const char *	name,
		SCIP_VAR *	binvar,
		SCIP_Real	binvalue
	)

static

create indicator constraint

Parameters

scip	SCIP data structure
lpinput	LP reading data
name	name of indicator constraint
binvar	binary indicator variable
binvalue	value of indicator part (0/1)

Definition at line 1388 of file reader_lp.c.

References FALSE, getNextToken(), hasError(), isSense(), isSign(), isValue(), LP_MAX_LINELEN, LP_SENSE_EQ, LP_SENSE_GE, LP_SENSE_LE, LP_SENSE_NOTHING, NULL, readCoefficients(), SCIP_Bool, SCIP_CALL, SCIP_INVALIDDATA, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_BINARY, SCIPaddCons(), SCIPchgVarLb(), SCIPchgVarType(), SCIPchgVarUb(), SCIPcreateConsIndicator(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPerrorMessage, SCIPfreeBlockMemoryArrayNull, SCIPgetNegatedVar(), SCIPisFeasEQ(), SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), syntaxError(), and TRUE.

Referenced by readConstraints().

◆ readConstraints()

static SCIP_RETCODE readConstraints	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the constraints section

Read linear and indicator constraints.

The CPLEX manual says that indicator constraints are of the following form:

[constraintname:] binaryvariable = value -> linear constraint

We also accept "<->".

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 1608 of file reader_lp.c.

References createIndicatorConstraint(), FALSE, getNextToken(), hasError(), isNewSection(), isSense(), isSign(), isValue(), LP_MAX_LINELEN, LP_SENSE_EQ, LP_SENSE_GE, LP_SENSE_LE, LP_SENSE_NOTHING, NULL, pushBufferToken(), pushToken(), readCoefficients(), SCIP_Bool, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIPaddCons(), SCIPcreateConsLinear(), SCIPcreateConsQuadratic(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPerrorMessage, SCIPfreeBlockMemoryArrayNull, SCIPinfinity(), SCIPisEQ(), SCIPreleaseCons(), SCIPsnprintf(), swapTokenBuffer(), syntaxError(), and TRUE.

Referenced by readLPFile().

◆ readBounds()

static SCIP_RETCODE readBounds	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the bounds section

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 1848 of file reader_lp.c.

References getNextToken(), getVariable(), isNewSection(), isSense(), isSign(), isValue(), LP_SENSE_EQ, LP_SENSE_GE, LP_SENSE_LE, LP_SENSE_NOTHING, NULL, pushToken(), SCIP_Bool, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIPchgVarLb(), SCIPchgVarUb(), SCIPdebugMsg, SCIPerrorMessage, SCIPinfinity(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetUbGlobal(), sign(), and syntaxError().

Referenced by readLPFile().

◆ readGenerals()

static SCIP_RETCODE readGenerals	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the generals section

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 2019 of file reader_lp.c.

References getNextToken(), getVariable(), isNewSection(), NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_INTEGER, SCIPchgVarType(), SCIPisFeasIntegral(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetUbGlobal(), SCIPwarningMessage(), and syntaxError().

Referenced by readLPFile().

◆ readBinaries()

static SCIP_RETCODE readBinaries	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the binaries section

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 2064 of file reader_lp.c.

References getNextToken(), getVariable(), isNewSection(), NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_BINARY, SCIPchgVarLb(), SCIPchgVarType(), SCIPchgVarUb(), SCIPisFeasEQ(), SCIPisFeasZero(), SCIPisInfinity(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetUbGlobal(), SCIPwarningMessage(), and syntaxError().

Referenced by readLPFile().

◆ readSemicontinuous()

static SCIP_RETCODE readSemicontinuous	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the semi-continuous section

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 2118 of file reader_lp.c.

References FALSE, getNextToken(), getVariable(), isNewSection(), NULL, pushToken(), SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPaddCons(), SCIPchgVarLb(), SCIPcreateConsBounddisjunction(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetName(), syntaxError(), and TRUE.

Referenced by readLPFile().

◆ readSos()

static SCIP_RETCODE readSos	(	SCIP *	scip,
		LPINPUT *	lpinput
	)

static

reads the sos section

The format is as follows:

SOS <constraint name>: [S1|S2]:: {<variable name>:<weight>} ... <constraint name>: [S1|S2]:: {<variable name>:<weight>}

Parameters

scip	SCIP data structure
lpinput	LP reading data

Definition at line 2216 of file reader_lp.c.

References FALSE, getNextToken(), isNewSection(), isSign(), isValue(), NULL, pushBufferToken(), pushToken(), SCIP_Bool, SCIP_CALL, SCIP_INVALIDDATA, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPABORT, SCIPaddCons(), SCIPaddVarSOS1(), SCIPaddVarSOS2(), SCIPconsGetName(), SCIPcreateConsSOS1(), SCIPcreateConsSOS2(), SCIPdebugMsg, SCIPdebugPrintCons, SCIPerrorMessage, SCIPfindVar(), SCIPmemccpy(), SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetName(), sign(), swapTokenBuffer(), syntaxError(), and TRUE.

Referenced by readLPFile().

◆ readLPFile()

static SCIP_RETCODE readLPFile	(	SCIP *	scip,
		LPINPUT *	lpinput,
		const char *	filename
	)

static

reads an LP file

Parameters

scip	SCIP data structure
lpinput	LP reading data
filename	name of the input file

Definition at line 2426 of file reader_lp.c.

References hasError(), LP_BINARIES, LP_BOUNDS, LP_CONSTRAINTS, LP_END, LP_GENERALS, LP_OBJECTIVE, LP_SEMICONTINUOUS, LP_SOS, LP_START, NULL, readBinaries(), readBounds(), readConstraints(), readGenerals(), readObjective(), readSemicontinuous(), readSos(), readStart(), SCIP_CALL, SCIP_INVALIDDATA, SCIP_NOFILE, SCIP_OKAY, SCIPcreateProb(), SCIPerrorMessage, SCIPfclose(), SCIPfopen(), and SCIPprintSysError().

Referenced by SCIPreadLp().

◆ SCIP_DECL_HASHGETKEY()

static SCIP_DECL_HASHGETKEY ( hashGetKeyVar )

static

hash key retrieval function for variables

Definition at line 2504 of file reader_lp.c.

◆ SCIP_DECL_HASHKEYEQ()

static SCIP_DECL_HASHKEYEQ ( hashKeyEqVar )

static

returns TRUE iff the indices of both variables are equal

Definition at line 2511 of file reader_lp.c.

References FALSE, and TRUE.

◆ SCIP_DECL_HASHKEYVAL()

static SCIP_DECL_HASHKEYVAL ( hashKeyValVar )

static

returns the hash value of the key

Definition at line 2520 of file reader_lp.c.

References SCIPvarGetIndex().

◆ getActiveVariables()

static SCIP_RETCODE getActiveVariables	(	SCIP *	scip,
		SCIP_VAR ***	vars,
		SCIP_Real **	scalars,
		int *	nvars,
		SCIP_Real *	constant,
		SCIP_Bool	transformed
	)

static

transforms given variables, scalars, and constant to the corresponding active variables, scalars, and constant

Parameters

scip	SCIP data structure
vars	pointer to vars array to get active variables for
scalars	pointer to scalars a_1, ..., a_n in linear sum a_1x_1 + ... + a_nx_n + c
nvars	pointer to number of variables and values in vars and vals array
constant	pointer to constant c in linear sum a_1x_1 + ... + a_nx_n + c
transformed	transformed constraint?

Definition at line 2528 of file reader_lp.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_NEGATED, SCIPgetProbvarLinearSum(), SCIPreallocBufferArray, SCIPvarGetNegatedVar(), SCIPvarGetOrigvarSum(), SCIPvarGetStatus(), and TRUE.

Referenced by printAggregatedCons(), and printQuadraticCons().

◆ clearLine()

static void clearLine	(	char *	linebuffer,
		int *	linecnt
	)

static

clears the given line buffer

Parameters

linebuffer	line
linecnt	number of characters in line

Definition at line 2583 of file reader_lp.c.

References NULL.

Referenced by endLine(), printRow(), printSOCCons(), printSosCons(), and SCIPwriteLp().

◆ endLine()

static void endLine	(	SCIP *	scip,
		FILE *	file,
		char *	linebuffer,
		int *	linecnt
	)

static

ends the given line with '\0' and prints it to the given file stream

Parameters

scip	SCIP data structure
file	output file (or NULL for standard output)
linebuffer	line
linecnt	number of characters in line

Definition at line 2597 of file reader_lp.c.

References clearLine(), LP_MAX_PRINTLEN, NULL, and SCIPinfoMessage().

Referenced by appendLine(), printRow(), printSOCCons(), printSosCons(), and SCIPwriteLp().

◆ appendLine()

static void appendLine	(	SCIP *	scip,
		FILE *	file,
		char *	linebuffer,
		int *	linecnt,
		const char *	extension
	)

static

appends extension to line and prints it to the give file stream if the line exceeded the length given in the define LP_PRINTLEN

Parameters

scip	SCIP data structure
file	output file (or NULL for standard output)
linebuffer	line
linecnt	number of characters in line
extension	string to extent the line

Definition at line 2620 of file reader_lp.c.

References endLine(), LP_MAX_PRINTLEN, LP_PRINTLEN, NULL, and SCIPdebugMsg.

Referenced by printRow(), printSOCCons(), printSosCons(), and SCIPwriteLp().

◆ printRow()

static void printRow	(	SCIP *	scip,
		FILE *	file,
		const char *	rowname,
		const char *	rownameextension,
		const char *	type,
		SCIP_VAR **	linvars,
		SCIP_Real *	linvals,
		int	nlinvars,
		SCIP_QUADVARTERM *	quadvarterms,
		int	nquadvarterms,
		SCIP_BILINTERM *	bilinterms,
		int	nbilinterms,
		SCIP_Real	rhs
	)

static

Parameters

scip	SCIP data structure
file	output file (or NULL for standard output)
rowname	row name
rownameextension	row name extension
type	row type ("=", "<=", or ">=")
linvars	array of linear variables
linvals	array of linear coefficient values
nlinvars	number of linear variables
quadvarterms	quadratic variable terms
nquadvarterms	number of quadratic variable terms
bilinterms	bilinear terms
nbilinterms	number of bilinear terms
rhs	right hand side

Definition at line 2651 of file reader_lp.c.

References appendLine(), clearLine(), endLine(), LP_MAX_NAMELEN, LP_MAX_PRINTLEN, NULL, SCIPisZero(), SCIPsnprintf(), and SCIPvarGetName().

Referenced by printAggregatedCons(), and printQuadraticCons().

◆ printQuadraticCons()

static SCIP_RETCODE printQuadraticCons	(	SCIP *	scip,
		FILE *	file,
		const char *	rowname,
		SCIP_VAR **	linvars,
		SCIP_Real *	linvals,
		int	nlinvars,
		SCIP_QUADVARTERM *	quadvarterms,
		int	nquadvarterms,
		SCIP_BILINTERM *	bilinterms,
		int	nbilinterms,
		SCIP_Real	lhs,
		SCIP_Real	rhs,
		SCIP_Bool	transformed
	)

static

prints given (linear or) quadratic constraint information in LP format to file stream

Parameters

scip	SCIP data structure
file	output file (or NULL for standard output)
rowname	name of the row
linvars	array of linear variables
linvals	array of linear coefficients values (or NULL if all linear coefficient values are 1)
nlinvars	number of linear variables
quadvarterms	quadratic variable terms
nquadvarterms	number of quadratic variable terms
bilinterms	bilinear terms
nbilinterms	number of bilinear terms
lhs	left hand side
rhs	right hand side
transformed	transformed constraint?

Definition at line 2791 of file reader_lp.c.

References getActiveVariables(), NULL, printRow(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPduplicateBufferArray, SCIPfreeBufferArray, SCIPisEQ(), and SCIPisInfinity().

Referenced by printAndCons(), and SCIPwriteLp().

◆ printSosCons()

static void printSosCons	(	SCIP *	scip,
		FILE *	file,
		const char *	rowname,
		SCIP_VAR **	vars,
		SCIP_Real *	weights,
		int	nvars,
		int	type
	)

static

prints given SOS constraint information in LP format to file stream

Parameters

scip	SCIP data structure
file	output file (or NULL for standard output)
rowname	name of the row
vars	array of variables
weights	array of weight values (or NULL)
nvars	number of variables
type	SOS type (SOS1 or SOS2)

Definition at line 2890 of file reader_lp.c.

References appendLine(), clearLine(), endLine(), LP_MAX_NAMELEN, LP_MAX_PRINTLEN, NULL, SCIPsnprintf(), and SCIPvarGetName().

Referenced by SCIPwriteLp().

◆ printSOCCons()

static SCIP_RETCODE printSOCCons	(	SCIP *	scip,
		FILE *	file,
		const char *	rowname,
		SCIP_CONS *	cons
	)

static

prints given soc constraint in LP format to file stream

Parameters

scip	SCIP data structure
file	output file (or NULL for standard output)
rowname	name of the row
cons	second order cone constraint

Definition at line 2949 of file reader_lp.c.

References appendLine(), clearLine(), endLine(), LP_MAX_NAMELEN, LP_MAX_PRINTLEN, NULL, SCIP_OKAY, SCIP_Real, SCIPgetLhsCoefsSOC(), SCIPgetLhsConstantSOC(), SCIPgetLhsOffsetsSOC(), SCIPgetLhsVarsSOC(), SCIPgetNLhsVarsSOC(), SCIPgetRhsCoefSOC(), SCIPgetRhsOffsetSOC(), SCIPgetRhsVarSOC(), SCIPisZero(), SCIPsnprintf(), and SCIPvarGetName().

Referenced by SCIPwriteLp().

◆ printAndCons()

static SCIP_RETCODE printAndCons	(	SCIP *	scip,
		FILE *	file,
		const char *	consname,
		SCIP_CONS *	cons,
		SCIP_Bool	aggrlinearizationands,
		SCIP_Bool	transformed
	)

static

prints a linearization of an and-constraint into the given file

Parameters

scip	SCIP data structure
file	output file (or NULL for standard output)
consname	name of the constraint
cons	and constraint
aggrlinearizationands	print weak or strong realaxation
transformed	transformed constraint?

Definition at line 3099 of file reader_lp.c.

References LP_MAX_NAMELEN, NULL, printQuadraticCons(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPfreeBufferArray, SCIPgetNVarsAnd(), SCIPgetResultantAnd(), SCIPgetVarsAnd(), SCIPinfinity(), and SCIPsnprintf().

Referenced by SCIPwriteLp().

◆ collectAggregatedVars()

static SCIP_RETCODE collectAggregatedVars	(	SCIP *	scip,
		SCIP_VAR **	vars,
		int	nvars,
		SCIP_VAR ***	aggvars,
		int *	naggvars,
		int *	saggvars,
		SCIP_HASHTABLE *	varAggregated
	)

static

check whether given variables are aggregated and put them into an array without duplication

Parameters

scip	SCIP data structure
vars	variable array
nvars	number of active variables in the problem
aggvars	pointer to array storing the aggregated variables on output
naggvars	pointer to number of aggregated variables on output
saggvars	pointer to number of slots in aggvars array
varAggregated	hashtable for checking duplicates

Definition at line 3186 of file reader_lp.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_AGGREGATED, SCIP_VARSTATUS_MULTAGGR, SCIP_VARSTATUS_NEGATED, SCIPcalcMemGrowSize(), SCIPhashtableExists(), SCIPhashtableInsert(), SCIPreallocBlockMemoryArray, and SCIPvarGetStatus().

Referenced by SCIPwriteLp().

◆ printAggregatedCons()

static SCIP_RETCODE printAggregatedCons	(	SCIP *	scip,
		FILE *	file,
		SCIP_Bool	transformed,
		int	nvars,
		int	nAggregatedVars,
		SCIP_VAR **	aggregatedVars
	)

static

print aggregated variable-constraints

Parameters

scip	SCIP data structure
file	output file (or NULL for standard output)
transformed	TRUE iff problem is the transformed problem
nvars	number of active variables in the problem
nAggregatedVars	number of aggregated variables
aggregatedVars	array storing the aggregated variables

Definition at line 3242 of file reader_lp.c.

References getActiveVariables(), LP_MAX_NAMELEN, NULL, printRow(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPfreeBufferArray, SCIPsnprintf(), and SCIPvarGetName().

Referenced by SCIPwriteLp().

◆ checkVarnames()

static void checkVarnames	(	SCIP *	scip,
		SCIP_VAR **	vars,
		int	nvars
	)

static

method check if the variable names are not longer than LP_MAX_NAMELEN

Parameters

scip	SCIP data structure
vars	array of variables
nvars	number of variables

Definition at line 3295 of file reader_lp.c.

References FALSE, LP_MAX_NAMELEN, NULL, SCIP_Bool, SCIPvarGetName(), SCIPwarningMessage(), and TRUE.

Referenced by SCIPwriteLp().

◆ checkConsnames()

static void checkConsnames	(	SCIP *	scip,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_Bool	transformed
	)

static

method check if the constraint names are not longer than LP_MAX_NAMELEN

Parameters

scip	SCIP data structure
conss	array of constraints
nconss	number of constraints
transformed	TRUE iff problem is the transformed problem

Definition at line 3332 of file reader_lp.c.

References FALSE, LP_MAX_NAMELEN, NULL, SCIP_Bool, SCIP_Real, SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetName(), SCIPconsIsEnabled(), SCIPconsIsTransformed(), SCIPgetLhsLinear(), SCIPisEQ(), SCIPwarningMessage(), and TRUE.

Referenced by SCIPwriteLp().

◆ SCIP_DECL_READERCOPY()

static SCIP_DECL_READERCOPY ( readerCopyLp )

static

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

Definition at line 3401 of file reader_lp.c.

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

◆ SCIP_DECL_READERFREE()

static SCIP_DECL_READERFREE ( readerFreeLp )

static

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

Definition at line 3415 of file reader_lp.c.

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

◆ SCIP_DECL_READERREAD()

static SCIP_DECL_READERREAD ( readerReadLp )

static

problem reading method of reader

Definition at line 3429 of file reader_lp.c.

References SCIP_CALL, SCIP_OKAY, and SCIPreadLp().

◆ SCIP_DECL_READERWRITE()

static SCIP_DECL_READERWRITE ( readerWriteLp )

static

problem writing method of reader

Definition at line 3440 of file reader_lp.c.

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

Variable Documentation

◆ commentchars

const char commentchars[] = "\\"

static

Definition at line 142 of file reader_lp.c.

Referenced by getNextLine().

SCIP

Detailed Description

Macros

Typedefs

Enumerations

Functions

Variables

Macro Definition Documentation

◆ READER_NAME

◆ READER_DESC

◆ READER_EXTENSION

◆ DEFAULT_LINEARIZE_ANDS

◆ DEFAULT_AGGRLINEARIZATION_ANDS

◆ LP_MAX_LINELEN

◆ LP_MAX_PUSHEDTOKENS

◆ LP_INIT_COEFSSIZE

◆ LP_INIT_QUADCOEFSSIZE

◆ LP_MAX_PRINTLEN

◆ LP_MAX_NAMELEN

◆ LP_PRINTLEN

Typedef Documentation

◆ LPSECTION

◆ LPEXPTYPE

◆ LPSENSE

◆ LPINPUT

Enumeration Type Documentation

◆ LpSection

◆ LpExpType

◆ LpSense

Function Documentation

◆ syntaxError()

◆ hasError()

◆ isDelimChar()

◆ isTokenChar()

◆ isValueChar()

◆ getNextLine()

◆ swapPointers()

◆ getNextToken()

◆ pushToken()

◆ pushBufferToken()

◆ swapTokenBuffer()

◆ isNewSection()

◆ isSign()

◆ isValue()

◆ isSense()

◆ getVariable()

◆ readStart()

◆ readCoefficients()

◆ readObjective()

◆ createIndicatorConstraint()

◆ readConstraints()

◆ readBounds()

◆ readGenerals()

◆ readBinaries()

◆ readSemicontinuous()

◆ readSos()

◆ readLPFile()

◆ SCIP_DECL_HASHGETKEY()

◆ SCIP_DECL_HASHKEYEQ()

◆ SCIP_DECL_HASHKEYVAL()

◆ getActiveVariables()

◆ clearLine()

◆ endLine()

◆ appendLine()

◆ printRow()

◆ printQuadraticCons()

◆ printSosCons()

◆ printSOCCons()

◆ printAndCons()

◆ collectAggregatedVars()

◆ printAggregatedCons()

◆ checkVarnames()

◆ checkConsnames()

◆ SCIP_DECL_READERCOPY()

◆ SCIP_DECL_READERFREE()

◆ SCIP_DECL_READERREAD()

◆ SCIP_DECL_READERWRITE()

Variable Documentation

◆ commentchars