Detailed Description

structures and methods for pseudo random number generation

Functions
int	SCIPrandomGetInt (SCIP_RANDNUMGEN *randnumgen, int minrandval, int maxrandval)

SCIP_RETCODE	SCIPrandomGetSubset (SCIP_RANDNUMGEN randnumgen, void set, int nelems, void *subset, int nsubelems)

SCIP_Real	SCIPrandomGetReal (SCIP_RANDNUMGEN *randnumgen, SCIP_Real minrandval, SCIP_Real maxrandval)

SCIP_RETCODE	SCIPcreateRandom (SCIP scip, SCIP_RANDNUMGEN *randnumgen, unsigned int initialseed, SCIP_Bool useglobalseed)

void	SCIPfreeRandom (SCIP scip, SCIP_RANDNUMGEN *randnumgen)

void	SCIPsetRandomSeed (SCIP scip, SCIP_RANDNUMGEN randnumgen, unsigned int seed)

unsigned int	SCIPinitializeRandomSeed (SCIP *scip, unsigned int initialseedvalue)

Function Documentation

◆ SCIPrandomGetInt()

int SCIPrandomGetInt	(	SCIP_RANDNUMGEN *	randnumgen,
		int	minrandval,
		int	maxrandval
	)

returns a random integer between minrandval and maxrandval

Parameters

randnumgen	random number generator
minrandval	minimal value to return
maxrandval	maximal value to return

Definition at line 10223 of file misc.c.

References randomGetRand(), SCIP_Longint, and SCIP_Real.

Referenced by calcPscostQuot(), chooseCoefVar(), chooseDoubleVar(), chooseFracVar(), chooseGuidedVar(), DECL_VARFIXINGS(), getRandomVariable(), getScore(), getScoreLikeCoefdiving(), getScoreOfFarkasDiving(), optimize(), permuteStartSolution(), SCIP_DECL_BANDITSELECT(), SCIP_DECL_BRANCHEXECLP(), SCIP_DECL_BRANCHEXECPS(), SCIP_DECL_DIVESETGETSCORE(), SCIP_DECL_HEUREXEC(), SCIPrandomGetSubset(), SCIPrandomPermuteArray(), SCIPrandomPermuteIntArray(), SCIPsolveConcurrent(), selectBranchingCandidate(), selectDiving(), selectInitialVariableDecomposition(), selectInitialVariableRandomly(), and selectSolsRandomized().

◆ SCIPrandomGetSubset()

SCIP_RETCODE SCIPrandomGetSubset	(	SCIP_RANDNUMGEN *	randnumgen,
		void **	set,
		int	nelems,
		void **	subset,
		int	nsubelems
	)

draws a random subset of disjoint elements from a given set of disjoint elements; this implementation is suited for the case that nsubelems is considerably smaller then nelems

Parameters

randnumgen	random number generator
set	original set, from which elements should be drawn
nelems	number of elements in original set
subset	subset in which drawn elements should be stored
nsubelems	number of elements that should be drawn and stored

Definition at line 10326 of file misc.c.

References BMScopyMemoryArray, r, SCIP_INVALIDDATA, SCIP_OKAY, SCIPerrorMessage, and SCIPrandomGetInt().

◆ SCIPrandomGetReal()

SCIP_Real SCIPrandomGetReal	(	SCIP_RANDNUMGEN *	randnumgen,
		SCIP_Real	minrandval,
		SCIP_Real	maxrandval
	)

returns a random real between minrandval and maxrandval

Parameters

randnumgen	random number generator
minrandval	minimal value to return
maxrandval	maximal value to return

Definition at line 10245 of file misc.c.

References randomGetRand(), and SCIP_Real.

Referenced by alnsFixMoreVariables(), alnsUnfixVariables(), applyNlobbt(), bilinboundGetScore(), computeFixingOrder(), computeScores(), computeVertexPolyhedralFacetLP(), createSubscip(), dataReset(), ensureStartingPoint(), estimateGradient(), execRelpscost(), generateGaussianNoise(), generateGMICuts(), getScore(), getScoreLikeCoefdiving(), getScoreOfFarkasDiving(), handleCycle(), LNSFixMoreVariables(), LNSUnfixVariables(), performRandRounding(), ReadMatrix(), sampleRandomPoints(), sampleWeighted(), SCIP_DECL_BANDITRESET(), SCIP_DECL_BANDITSELECT(), SCIP_DECL_DIVESETGETSCORE(), SCIP_DECL_HEUREXEC(), SCIP_DECL_NLPISOLVE(), SCIP_DECL_READERREAD(), SCIP_DECL_SEPAEXECLP(), SCIPapplyLockFixings(), scoring(), selectBranchVar(), selectDiving(), setupStart(), sortVariables(), and updateBestCandidate().

◆ SCIPcreateRandom()

SCIP_RETCODE SCIPcreateRandom	(	SCIP *	scip,
		SCIP_RANDNUMGEN **	randnumgen,
		unsigned int	initialseed,
		SCIP_Bool	useglobalseed
	)

creates and initializes a random number generator

Note: The initial seed is changed using SCIPinitializeRandomSeed()

Parameters

scip	SCIP data structure
randnumgen	random number generator
initialseed	initial random seed
useglobalseed	should the supplied seed be initialized by SCIP's global seed shift?

Definition at line 56 of file scip_randnumgen.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPblkmem(), SCIPinitializeRandomSeed(), and SCIPrandomCreate().

Referenced by computeVertexPolyhedralFacetLP(), conshdlrdataCreate(), DECL_NHINIT(), ensureStartingPoint(), estimateGradient(), probdataCreate(), runCyckerlin(), SCIP_DECL_BRANCHINIT(), SCIP_DECL_BRANCHINITSOL(), SCIP_DECL_CUTSELINIT(), SCIP_DECL_HEURINIT(), SCIP_DECL_NLPICREATEPROBLEM(), SCIP_DECL_PRICERINIT(), SCIP_DECL_PROPINIT(), SCIP_DECL_PROPINITSOL(), SCIP_DECL_READERREAD(), SCIP_DECL_SEPAINIT(), SCIP_DECL_SEPAINITSOL(), SCIPincludeBranchrulePscost(), SCIPincludeHeurAdaptivediving(), SCIPpermuteProb(), SCIPsolveConcurrent(), selectBranchingCandidate(), and setupStart().