Contents
zfft3i - initialize the array WSAVE, which is used in both
ZFFT3F and ZFFT3B.
SUBROUTINE ZFFT3I(M, N, K, WORK)
INTEGER M, N, K
DOUBLE PRECISION WORK(*)
SUBROUTINE ZFFT3I_64(M, N, K, WORK)
INTEGER*8 M, N, K
DOUBLE PRECISION WORK(*)
F95 INTERFACE
SUBROUTINE ZFFT3I(M, N, K, WORK)
INTEGER :: M, N, K
REAL(8), DIMENSION(:) :: WORK
SUBROUTINE ZFFT3I_64(M, N, K, WORK)
INTEGER(8) :: M, N, K
REAL(8), DIMENSION(:) :: WORK
C INTERFACE
#include <sunperf.h>
void zfft3i(int m, int n, int k, double *work);
void zfft3i_64(long m, long n, long k, double *work);
M (input) Number of rows to be transformed. M >= 0.
N (input) Number of columns to be transformed. N >= 0.
K (input) Number of planes to be transformed. K >= 0.
WORK (input/output)
On entry, an array of dimension (4*(M + N + K) +
45) or greater. ZFFT3I needs to be called only
once to initialize array WORK before calling
ZFFT3F and/or ZFFT3B if M, N, K and WORK 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.