zfft2i - initialize the array WSAVE, which is used in both the forward and backward transforms.
SUBROUTINE ZFFT2I(M, N, WORK) INTEGER M, N DOUBLE PRECISION WORK(*) SUBROUTINE ZFFT2I_64(M, N, WORK) INTEGER*8 M, N DOUBLE PRECISION WORK(*) F95 INTERFACE SUBROUTINE ZFFT2I(M, N, WORK) INTEGER :: M, N REAL(8), DIMENSION(:) :: WORK SUBROUTINE ZFFT2I_64(M, N, WORK) INTEGER(8) :: M, N REAL(8), DIMENSION(:) :: WORK C INTERFACE #include <sunperf.h> void zfft2i(int m, int n, double *work); void zfft2i_64(long m, long n, double *work);
Oracle Solaris Studio Performance Library zfft2i(3P) NAME zfft2i - initialize the array WSAVE, which is used in both the forward and backward transforms. SYNOPSIS SUBROUTINE ZFFT2I(M, N, WORK) INTEGER M, N DOUBLE PRECISION WORK(*) SUBROUTINE ZFFT2I_64(M, N, WORK) INTEGER*8 M, N DOUBLE PRECISION WORK(*) F95 INTERFACE SUBROUTINE ZFFT2I(M, N, WORK) INTEGER :: M, N REAL(8), DIMENSION(:) :: WORK SUBROUTINE ZFFT2I_64(M, N, WORK) INTEGER(8) :: M, N REAL(8), DIMENSION(:) :: WORK C INTERFACE #include <sunperf.h> void zfft2i(int m, int n, double *work); void zfft2i_64(long m, long n, double *work); ARGUMENTS 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 (4 * (M + N) + 30) or greater. ZFFT2I needs to be called only once to initialize array WORK before calling ZFFT2F and/or ZFFT2B 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 initializa- tion of the workspace. 7 Nov 2015 zfft2i(3P)