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