rfftb man page on OpenIndiana

rfftb man page on OpenIndiana

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rfftb(3P)		    Sun Performance Library		     rfftb(3P)

NAME
       rfftb - compute a periodic sequence from its Fourier coefficients.  The
       RFFT operations are unnormalized, so a call of RFFTF followed by a call
       of RFFTB will multiply the input sequence by N.

SYNOPSIS
       SUBROUTINE RFFTB(N, X, WSAVE)

       INTEGER N
       REAL X(*), WSAVE(*)

       SUBROUTINE RFFTB_64(N, X, WSAVE)

       INTEGER*8 N
       REAL X(*), WSAVE(*)

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

       INTEGER :: N
       REAL, DIMENSION(:) :: X, WSAVE

       SUBROUTINE FFTB_64([N], X, WSAVE)

       INTEGER(8) :: N
       REAL, DIMENSION(:) :: X, WSAVE

   C INTERFACE
       #include <sunperf.h>

       void rfftb(int n, float *x, float *wsave);

       void rfftb_64(long n, float *x, float *wsave);

ARGUMENTS
       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.

       WSAVE (input/output)
		 On entry, WSAVE must be an array of dimension (2 * N + 15) or
		 greater and must have been initialized by RFFTI.

				  6 Mar 2009			     rfftb(3P)

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