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