Contents
rfft2i - initialize the array WSAVE, which is used in both
the forward and backward transforms.
SUBROUTINE RFFT2I(M, N, WORK)
INTEGER M, N
REAL WORK(*)
SUBROUTINE RFFT2I_64(M, N, WORK)
INTEGER*8 M, N
REAL WORK(*)
F95 INTERFACE
SUBROUTINE FFT2I(M, N, WORK)
INTEGER :: M, N
REAL, DIMENSION(:) :: WORK
SUBROUTINE FFT2I_64(M, N, WORK)
INTEGER(8) :: M, N
REAL, DIMENSION(:) :: WORK
C INTERFACE
#include <sunperf.h>
void rfft2i(int m, int n, float *work);
void rfft2i_64(long m, long n, float *work);
M (input) Number of rows to be transformed. M >= 0.
N (input) Number of columns to be transformed. N >= 0.
WORK (input/output)
On entry, an array of dimension (M + 2*N + MAX(M,
2*N) + 30) or greater. RFFT2I needs to be called
only once to initialize array WORK before calling
RFFT2F and/or RFFT2B if M, N 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.