ezfftf (3p)

Name

ezfftf - computes the Fourier coefficients of a periodic sequence. EZFFTF is a simplified but slower version of RFFTF.

Synopsis

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

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

SUBROUTINE EZFFTF_64(N, R, AZERO, A, B, WSAVE)

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




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

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

SUBROUTINE EZFFTF_64(N, R, AZERO, A, B, WSAVE)

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




C INTERFACE
#include <sunperf.h>

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

void ezfftf_64(long n, float *r, float azero, float *a, float *b, float
*wsave);

Description

Oracle Solaris Studio Performance Library                           ezfftf(3P)



NAME
       ezfftf  -  computes  the  Fourier  coefficients of a periodic sequence.
       EZFFTF is a simplified but slower version of RFFTF.

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

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

       SUBROUTINE EZFFTF_64(N, R, AZERO, A, B, WSAVE)

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




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

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

       SUBROUTINE EZFFTF_64(N, R, AZERO, A, B, WSAVE)

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




   C INTERFACE
       #include <sunperf.h>

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

       void ezfftf_64(long n, float *r, float azero, float *a, float *b, float
                 *wsave);



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

       R (input) A real array of length N containing the sequence to be trans-
                 formed.  On exit, R is unchanged.

       AZERO (output)
                 On exit, the sum from i=1 to i=n of r(i)/n.

       A (output)
                 On exit, arrays that contain the  remaining  Fourier  coeffi-
                 cients.

       B (output)
                 On  exit,  arrays  that contain the remaining Fourier coeffi-
                 cients.

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



                                  7 Nov 2015                        ezfftf(3P)