Permutations Shuffling

Detailed Description

Functions
void	SCIPswapInts (int *value1, int *value2)
void	SCIPswapPointers (void **pointer1, void **pointer2)
void	SCIPpermuteIntArray (int *array, int begin, int end, unsigned int *randseed)
void	SCIPpermuteArray (void **array, int begin, int end, unsigned int *randseed)
SCIP_RETCODE	SCIPgetRandomSubset (void **set, int nelems, void **subset, int nsubelems, unsigned int randseed)

Function Documentation

void SCIPswapInts	(	int *	value1,
		int *	value2
	)

swaps two ints

Parameters

value1	pointer to first integer
value2	pointer ti second integer

void SCIPswapPointers	(	void **	pointer1,
		void **	pointer2
	)

swaps the addresses of two pointers

Parameters

pointer1	first pointer
pointer2	second pointer

void SCIPpermuteIntArray	(	int *	array,
		int	begin,
		int	end,
		unsigned int *	randseed
	)

randomly shuffles parts of an integer array using the Fisher-Yates algorithm

Parameters

array	array to be shuffled
begin	first index that should be subject to shuffling (0 for whole array)
end	last index that should be subject to shuffling (array size for whole array)
randseed	seed value for the random generator

void SCIPpermuteArray	(	void **	array,
		int	begin,
		int	end,
		unsigned int *	randseed
	)

randomly shuffles parts of an array using the Fisher-Yates algorithm

Parameters

array	array to be shuffled
begin	first index that should be subject to shuffling (0 for whole array)
end	last index that should be subject to shuffling (array size for whole array)
randseed	pointer to seed value for the random generator

SCIP_RETCODE SCIPgetRandomSubset	(	void **	set,
		int	nelems,
		void **	subset,
		int	nsubelems,
		unsigned int	randseed
	)

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

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