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HPL_perm(3)		     HPL Library Functions		   HPL_perm(3)

NAME
       HPL_perm	- Combine 2 index arrays - Generate the	permutation.

SYNOPSIS
       #include	"hpl.h"

       void HPL_perm( const int	N, int * LINDXA, int * LINDXAU,	int * IWORK );

DESCRIPTION
       HPL_perm	 combines   two	 index	arrays	and generate the corresponding
       permutation. First, this	function computes the inverse of  LINDXA,  and
       then  combine  it with LINDXAU.	Second,	in order to be able to perform
       the permutation in place,  LINDXAU  is overwritten by the  sequence  of
       permutation   producing	 the  same result.  What we ultimately want to
       achieve is:  U[LINDXAU[i]] := U[LINDXA[i]] for i	in [0..N).  After  the
       call  to	 this function,	 this in place permutation can be performed by
       for i in	[0..N) swap U[i] with U[LINDXAU[i]].

ARGUMENTS
       N       (global input)	       const int
	       On entry,  N  specifies the length of the arrays	  LINDXA   and
	       LINDXAU.	N should be at least zero.

       LINDXA  (global input/output)   int *
	       On  entry,   LINDXA  is an array	of dimension N	containing the
	       source indexes. On exit,	 LINDXA	 contains the  combined	 index
	       array.

       LINDXAU (global input/output)   int *
	       On  entry,   LINDXAU is an array	of dimension N	containing the
	       target indexes.	On exit,  LINDXAU  contains  the  sequence  of
	       permutation,   that   should be applied	in increasing order to
	       permute the underlying array U in place.

       IWORK   (workspace)	       int *
	       On entry, IWORK is a workarray of dimension N.

SEE ALSO
       HPL_plindx1 (3),	HPL_pdlaswp01N (3), HPL_pdlaswp01T (3).

HPL 2.1			       October 26, 2012			   HPL_perm(3)

NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | SEE ALSO

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