zfft3b (3p)

Name

zfft3b - compute a periodic sequence from its Fourier coefficients. The FFT operations are unnormalized, so a call of ZFFT3F followed by a call of ZFFT3B will multiply the input sequence by M*N*K.

Synopsis

SUBROUTINE ZFFT3B(M, N, K, A, LDA, LD2A, WORK, LWORK)

DOUBLE COMPLEX A(LDA,LD2A,*)
INTEGER M, N, K, LDA, LD2A, LWORK
DOUBLE PRECISION WORK(*)

SUBROUTINE ZFFT3B_64(M, N, K, A, LDA, LD2A, WORK, LWORK)

DOUBLE COMPLEX A(LDA,LD2A,*)
INTEGER*8 M, N, K, LDA, LD2A, LWORK
DOUBLE PRECISION WORK(*)




F95 INTERFACE
SUBROUTINE FFT3B(M, N, K, A, LDA, LD2A, WORK, LWORK)

COMPLEX(8), DIMENSION(:,:,:) :: A
INTEGER :: M, N, K, LDA, LD2A, LWORK
REAL(8), DIMENSION(:) :: WORK

SUBROUTINE FFT3B_64(M, N, K, A, LDA, LD2A, WORK, LWORK)

COMPLEX(8), DIMENSION(:,:,:) :: A
INTEGER(8) :: M, N, K, LDA, LD2A, LWORK
REAL(8), DIMENSION(:) :: WORK




C INTERFACE
#include <sunperf.h>

void  zfft3b(int  m, int n, int k, doublecomplex *a, int lda, int ld2a,
double *work, int lwork);

void zfft3b_64(long m, long n, long k, doublecomplex *a, long lda, long
ld2a, double *work, long lwork);

Description

Oracle Solaris Studio Performance Library                           zfft3b(3P)



NAME
       zfft3b  -  compute  a  periodic sequence from its Fourier coefficients.
       The FFT operations are unnormalized, so a call of ZFFT3F followed by  a
       call of ZFFT3B will multiply the input sequence by M*N*K.


SYNOPSIS
       SUBROUTINE ZFFT3B(M, N, K, A, LDA, LD2A, WORK, LWORK)

       DOUBLE COMPLEX A(LDA,LD2A,*)
       INTEGER M, N, K, LDA, LD2A, LWORK
       DOUBLE PRECISION WORK(*)

       SUBROUTINE ZFFT3B_64(M, N, K, A, LDA, LD2A, WORK, LWORK)

       DOUBLE COMPLEX A(LDA,LD2A,*)
       INTEGER*8 M, N, K, LDA, LD2A, LWORK
       DOUBLE PRECISION WORK(*)




   F95 INTERFACE
       SUBROUTINE FFT3B(M, N, K, A, LDA, LD2A, WORK, LWORK)

       COMPLEX(8), DIMENSION(:,:,:) :: A
       INTEGER :: M, N, K, LDA, LD2A, LWORK
       REAL(8), DIMENSION(:) :: WORK

       SUBROUTINE FFT3B_64(M, N, K, A, LDA, LD2A, WORK, LWORK)

       COMPLEX(8), DIMENSION(:,:,:) :: A
       INTEGER(8) :: M, N, K, LDA, LD2A, LWORK
       REAL(8), DIMENSION(:) :: WORK




   C INTERFACE
       #include <sunperf.h>

       void  zfft3b(int  m, int n, int k, doublecomplex *a, int lda, int ld2a,
                 double *work, int lwork);

       void zfft3b_64(long m, long n, long k, doublecomplex *a, long lda, long
                 ld2a, double *work, long lwork);



ARGUMENTS
       M (input) Number of rows to be transformed.  These subroutines are most
                 efficient when M is a product of small primes.  M >= 0.


       N (input) Number of columns to be transformed.  These  subroutines  are
                 most  efficient when N is a product of small primes.  N >= 0.


       K (input) Number of planes to be transformed.   These  subroutines  are
                 most  efficient when K is a product of small primes.  K >= 0.


       A (input/output)
                 On entry, a three-dimensional array A(LDA,LD2A,K)  that  con-
                 tains the sequences to be transformed.


       LDA (input)
                 Leading  dimension  of  the  array  containing the data to be
                 transformed.  LDA >= M.


       LD2A (input)
                 Second dimension of the  array  containing  the  data  to  be
                 transformed.  LD2A >= N.


       WORK (input)
                 On  input,  workspace  WORK  must  have  been  initialized by
                 ZFFT3I.


       LWORK (input)
                 The dimension of the array WORK.  LWORK >= (4*(M + N +  K)  +
                 45).




                                  7 Nov 2015                        zfft3b(3P)