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);

Description

Oracle Solaris Studio 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.



                                  7 Nov 2015                        ezfftb(3P)