dezftf - computes the Fourier coefficients of a periodic sequence. DEZFTF is a simplified but slower version of DFFTF.
SUBROUTINE DEZFTF(N, R, AZERO, A, B, WSAVE) INTEGER N DOUBLE PRECISION AZERO DOUBLE PRECISION R(*), A(*), B(*), WSAVE(*) SUBROUTINE DEZFTF_64(N, R, AZERO, A, B, WSAVE) INTEGER*8 N DOUBLE PRECISION AZERO DOUBLE PRECISION R(*), A(*), B(*), WSAVE(*) F95 INTERFACE SUBROUTINE DEZFTF(N, R, AZERO, A, B, WSAVE) INTEGER :: N REAL(8) :: AZERO REAL(8), DIMENSION(:) :: R, A, B, WSAVE SUBROUTINE DEZFTF_64(N, R, AZERO, A, B, WSAVE) INTEGER(8) :: N REAL(8) :: AZERO REAL(8), DIMENSION(:) :: R, A, B, WSAVE C INTERFACE #include <sunperf.h> void dezftf(int n, double *r, double *azero, double *a, double *b, dou- ble *wsave); void dezftf_64(long n, double *r, double *azero, double *a, double *b, double *wsave);
Oracle Solaris Studio Performance Library dezftf(3P) NAME dezftf - computes the Fourier coefficients of a periodic sequence. DEZFTF is a simplified but slower version of DFFTF. SYNOPSIS SUBROUTINE DEZFTF(N, R, AZERO, A, B, WSAVE) INTEGER N DOUBLE PRECISION AZERO DOUBLE PRECISION R(*), A(*), B(*), WSAVE(*) SUBROUTINE DEZFTF_64(N, R, AZERO, A, B, WSAVE) INTEGER*8 N DOUBLE PRECISION AZERO DOUBLE PRECISION R(*), A(*), B(*), WSAVE(*) F95 INTERFACE SUBROUTINE DEZFTF(N, R, AZERO, A, B, WSAVE) INTEGER :: N REAL(8) :: AZERO REAL(8), DIMENSION(:) :: R, A, B, WSAVE SUBROUTINE DEZFTF_64(N, R, AZERO, A, B, WSAVE) INTEGER(8) :: N REAL(8) :: AZERO REAL(8), DIMENSION(:) :: R, A, B, WSAVE C INTERFACE #include <sunperf.h> void dezftf(int n, double *r, double *azero, double *a, double *b, dou- ble *wsave); void dezftf_64(long n, double *r, double *azero, double *a, double *b, double *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) On entry, a real array of length N containing the sequence to be transformed. 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 DEZFTI. 7 Nov 2015 dezftf(3P)