Contents
dfft3i - initialize the array WSAVE, which is used in both
DFFT3F and DFFT3B.
SUBROUTINE DFFT3I(M, N, K, WORK)
INTEGER M, N, K
DOUBLE PRECISION WORK(*)
SUBROUTINE DFFT3I_64(M, N, K, WORK)
INTEGER*8 M, N, K
DOUBLE PRECISION WORK(*)
F95 INTERFACE
SUBROUTINE FFT3I(M, N, K, WORK)
INTEGER :: M, N, K
REAL(8), DIMENSION(:) :: WORK
SUBROUTINE FFT3I_64(M, N, K, WORK)
INTEGER(8) :: M, N, K
REAL(8), DIMENSION(:) :: WORK
C INTERFACE
#include <sunperf.h>
void dfft3i(int m, int n, int k, double *work);
void dfft3i_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 (M + 2*(N + K) +
30) or greater. DFFT3I needs to be called only
once to initialize array WORK before calling
DFFT3F and/or DFFT3B 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.