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