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SCIP Doxygen Documentation: Random Numbers

structures and methods for pseudo random number generation

returns a random integer between minrandval and maxrandval

Deprecated:

Please use SCIPrandomGetInt() to request a random integer.

returns a random integer between minrandval and maxrandval

Deprecated:

Please use SCIPrandomGetInt() to request a random integer.

Parameters

minrandval minimal value to return maxrandval maximal value to return seedp pointer to seed value

Definition at line 9994 of file misc.c.

References getRandomInt().

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 10111 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().

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 10214 of file misc.c.

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

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 10133 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(), 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().

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

Deprecated:

Please use SCIPrandomGetSubset()

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

Deprecated:

Please use SCIPrandomGetSubset()

Parameters

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 randseed seed value for random generator

Definition at line 10483 of file misc.c.

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

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().

frees a random number generator

Parameters

scip SCIP data structure randnumgen random number generator

Definition at line 79 of file scip_randnumgen.c.

References NULL, SCIPblkmem(), and SCIPrandomFree().

Referenced by conshdlrdataFree(), DECL_NHEXIT(), DECL_NHINIT(), probdataFree(), runCyckerlin(), SCIP_DECL_BRANCHEXIT(), SCIP_DECL_BRANCHEXITSOL(), SCIP_DECL_BRANCHFREE(), SCIP_DECL_CONSEXIT(), SCIP_DECL_CONSFREE(), SCIP_DECL_CUTSELEXIT(), SCIP_DECL_HEUREXIT(), SCIP_DECL_HEURFREE(), SCIP_DECL_NLHDLREXIT(), SCIP_DECL_NLPIFREE(), SCIP_DECL_NLPIFREEPROBLEM(), SCIP_DECL_PRICEREXIT(), SCIP_DECL_PROPEXIT(), SCIP_DECL_PROPEXITSOL(), SCIP_DECL_READERREAD(), SCIP_DECL_SEPAEXIT(), SCIP_DECL_SEPAEXITSOL(), SCIPpermuteProb(), and SCIPsolveConcurrent().

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