Contents
ezfftb - computes a periodic sequence from its Fourier coef-
ficients. EZFFTB is a simplified but slower version of
RFFTB.
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);
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/output)
On entry, arrays that contain the remaining
Fourier coefficients. On exit, these arrays are
unchanged.
B (input/output)
On entry, arrays that contain the remaining
Fourier coefficients. On exit, these arrays are
unchanged.
WSAVE (input)
On entry, an array with dimension of at least (3 *
N + 15), initialized by EZFFTI.