vcffti(3P) Sun Performance Library vcffti(3P)NAMEvcffti - initialize the array WSAVE, which is used in both VCFFTF and
VCFFTB.
SYNOPSIS
SUBROUTINE VCFFTI(N, WSAVE)
COMPLEX WSAVE(*)
INTEGER N
SUBROUTINE VCFFTI_64(N, WSAVE)
COMPLEX WSAVE(*)
INTEGER*8 N
F95 INTERFACE
SUBROUTINE VFFTI(N, WSAVE)
COMPLEX, DIMENSION(:) :: WSAVE
INTEGER :: N
SUBROUTINE VFFTI_64(N, WSAVE)
COMPLEX, DIMENSION(:) :: WSAVE
INTEGER(8) :: N
C INTERFACE
#include <sunperf.h>
void vcffti(int n, complex *wsave);
void vcffti_64(long n, complex *wsave);
ARGUMENTS
N (input) Length of the sequence to be transformed. N >= 0.
WSAVE (input/output)
On entry, an array of dimension (2*N + 15) or greater.
VCFFTI needs to be called only once to initialize WSAVE
before calling VCFFTF and/or VCFFTB 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 vcffti(3P)