vrfftb man page on OpenIndiana

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vrfftb(3P)		    Sun Performance Library		    vrfftb(3P)

NAME
       vrfftb  -  compute  a  periodic sequence from its Fourier coefficients.
       The VRFFT operations are normalized, so a call of VRFFTF followed by  a
       call of VRFFTB will return the original sequence.

SYNOPSIS
       SUBROUTINE VRFFTB(M, N, X, XT, MDIMX, WSAVE)

       INTEGER M, N, MDIMX
       REAL X(MDIMX,*), XT(MDIMX,*), WSAVE(*)

       SUBROUTINE VRFFTB_64(M, N, X, XT, MDIMX, WSAVE)

       INTEGER*8 M, N, MDIMX
       REAL X(MDIMX,*), XT(MDIMX,*), WSAVE(*)

   F95 INTERFACE
       SUBROUTINE FFTB([M], [N], X, XT, [MDIMX], WSAVE)

       INTEGER :: M, N, MDIMX
       REAL, DIMENSION(:) :: WSAVE
       REAL, DIMENSION(:,:) :: X, XT

       SUBROUTINE FFTB_64([M], [N], X, XT, [MDIMX], WSAVE)

       INTEGER(8) :: M, N, MDIMX
       REAL, DIMENSION(:) :: WSAVE
       REAL, DIMENSION(:,:) :: X, XT

   C INTERFACE
       #include <sunperf.h>

       void  vrfftb(int	 m,  int  n,  float  *x,  float	 *xt, int mdimx, float
		 *wsave);

       void vrfftb_64(long m, long n, float *x, float *xt, long	 mdimx,	 float
		 *wsave);

ARGUMENTS
       M (input) The number of sequences to be transformed.  M >= 0.

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

       X (input/output)
		 On  entry, an array of length N containing the sequence to be
		 transformed.  For VRFFTF, a real two-dimensional array X(M,N)
		 whose rows contain the sequences to be transformed.

       XT (workspace)
		 A real two-dimensional work array with dimensions of (MDIMX x
		 N).

       MDIMX (input)
		 Leading dimension of the arrays X and XT as  specified	 in  a
		 dimension or type statement.  MDIMX >= M.

       WSAVE (input)
		 On entry, an array of dimension (N+15) or greater initialized
		 by VRFFTI.

				  6 Mar 2009			    vrfftb(3P)
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