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cfft2b(3P)		    Sun Performance Library		    cfft2b(3P)

NAME
       cfft2b  -  compute  a  periodic sequence from its Fourier coefficients.
       The xFFT operations are unnormalized, so a call of xFFT2F followed by a
       call of xFFT2B will multiply the input sequence by M*N.

SYNOPSIS
       SUBROUTINE CFFT2B(M, N, A, LDA, WORK, LWORK)

       COMPLEX A(LDA,*)
       INTEGER M, N, LDA, LWORK
       REAL WORK(*)

       SUBROUTINE CFFT2B_64(M, N, A, LDA, WORK, LWORK)

       COMPLEX A(LDA,*)
       INTEGER*8 M, N, LDA, LWORK
       REAL WORK(*)

   F95 INTERFACE
       SUBROUTINE FFT2B([M], [N], A, [LDA], WORK, LWORK)

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

       SUBROUTINE FFT2B_64([M], [N], A, [LDA], WORK, LWORK)

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

   C INTERFACE
       #include <sunperf.h>

       void cfft2b(int m, int n, complex *a, int lda, float *work, int lwork);

       void  cfft2b_64(long m, long n, complex *a, long lda, float *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.

       A (input/output)
		 On entry, a two-dimensional array A(M,N)  that	 contains  the
		 sequences to be transformed.

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

       WORK (input)
		 On input,  workspace  WORK  must  have	 been  initialized  by
		 CFFT2I.

       LWORK (input)
		 The dimension of the array WORK.  LWORK >= (4 * (M + N) + 30)

				  6 Mar 2009			    cfft2b(3P)
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