cffti man page on OpenIndiana

cffti man page on OpenIndiana

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cffti(3P)		    Sun Performance Library		     cffti(3P)

NAME
       cffti  -	 initialize  the  array WSAVE, which is used in both CFFTF and
       CFFTB.

SYNOPSIS
       SUBROUTINE CFFTI(N, WSAVE)

       INTEGER N
       REAL WSAVE(*)

       SUBROUTINE CFFTI_64(N, WSAVE)

       INTEGER*8 N
       REAL WSAVE(*)

   F95 INTERFACE
       SUBROUTINE CFFTI(N, WSAVE)

       INTEGER :: N
       REAL, DIMENSION(:) :: WSAVE

       SUBROUTINE CFFTI_64(N, WSAVE)

       INTEGER(8) :: N
       REAL, DIMENSION(:) :: WSAVE

   C INTERFACE
       #include <sunperf.h>

       void cffti(int n, float *wsave);

       void cffti_64(long n, float *wsave);

ARGUMENTS
       N (input) Length of the sequence to be transformed.  N >= 0.

       WSAVE (input/output)
		 On entry, an array of dimension (4 *  N  +  15)  or  greater.
		 CFFTI	needs  to be called only once to initialize array WORK
		 before calling CFFTF and/or  CFFTB  if	 N  and	 WSAVE	remain
		 unchanged  between  these calls.  Thus, subsequent transforms
		 or inverse transforms of same size  can  be  obtained	faster
		 than  the  first  since they do not require initialization of
		 the workspace.

				  6 Mar 2009			     cffti(3P)

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