ezffti - initializes the array WSAVE, which is used in both EZFFTF and EZFFTB.
=head1 SYNOPSIS
SUBROUTINE EZFFTI( N, WSAVE)
INTEGER N
REAL WSAVE(*)
SUBROUTINE EZFFTI_64( N, WSAVE)
INTEGER*8 N
REAL WSAVE(*)
SUBROUTINE EZFFTI( N, WSAVE)
INTEGER :: N
REAL, DIMENSION(:) :: WSAVE
SUBROUTINE EZFFTI_64( N, WSAVE)
INTEGER(8) :: N
REAL, DIMENSION(:) :: WSAVE
#include <sunperf.h>
void ezffti(int n, float *wsave);
void ezffti_64(long n, float *wsave);
- N (input)
Length of the sequence to be transformed. N > = 0.
- WSAVE (input/output)
On entry, an array with a dimension of at least (3 * N + 15). The same work array can be used for
both EZFFTF and EZFFTB as long as N remains unchanged. Different WSAVE arrays are required
for different values of N. This initialization does not have to be repeated between calls to EZFFTF or
EZFFTB as long as N and WSAVE remain unchanged, thus subsequent transforms can be obtained
faster than the first.