ezfftb man page on OpenIndiana

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ezfftb(3P)		    Sun Performance Library		    ezfftb(3P)

NAME
       ezfftb  -  computes  a periodic sequence from its Fourier coefficients.
       EZFFTB is a simplified but slower version of RFFTB.

SYNOPSIS
       SUBROUTINE EZFFTB(N, R, AZERO, A, B, WSAVE)

       INTEGER N
       REAL AZERO
       REAL R(*), A(*), B(*), WSAVE(*)

       SUBROUTINE EZFFTB_64(N, R, AZERO, A, B, WSAVE)

       INTEGER*8 N
       REAL AZERO
       REAL R(*), A(*), B(*), WSAVE(*)

   F95 INTERFACE
       SUBROUTINE EZFFTB(N, R, AZERO, A, B, WSAVE)

       INTEGER :: N
       REAL :: AZERO
       REAL, DIMENSION(:) :: R, A, B, WSAVE

       SUBROUTINE EZFFTB_64(N, R, AZERO, A, B, WSAVE)

       INTEGER(8) :: N
       REAL :: AZERO
       REAL, DIMENSION(:) :: R, A, B, WSAVE

   C INTERFACE
       #include <sunperf.h>

       void ezfftb(int n, float *r, float azero, float	*a,  float  *b,	 float
		 *wsave);

       void ezfftb_64(long n, float *r, float azero, float *a, float *b, float
		 *wsave);

ARGUMENTS
       N (input) Length of the sequence to be synthesized.  The method is most
		 efficient when N is the product of small primes.  N >= 0.

       R (output)
		 On exit, the Fourier synthesis of the inputs.

       AZERO (input)
		 On  entry, the constant Fourier coefficient A0.  Unchanged on
		 exit.

       A (input) On entry, arrays that contain the remaining  Fourier  coeffi‐
		 cients.  On exit, these arrays are unchanged.

       B (input) On  entry,  arrays that contain the remaining Fourier coeffi‐
		 cients.  On exit, these arrays are unchanged.

       WSAVE (input)
		 On entry, an array with dimension of at least (3 * N  +  15),
		 initialized by EZFFTI.

				  6 Mar 2009			    ezfftb(3P)
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