dcosqf (3p)

Name

dcosqf - tation with only odd wave numbers. The COSQ operations are unnormal- ized inverses of themselves, so a call to COSQF followed by a call to COSQB will multiply the input sequence by 4 * N.

Synopsis

SUBROUTINE DCOSQF(N, X, WSAVE)

INTEGER N
DOUBLE PRECISION X(*), WSAVE(*)

SUBROUTINE DCOSQF_64(N, X, WSAVE)

INTEGER*8 N
DOUBLE PRECISION X(*), WSAVE(*)




F95 INTERFACE
SUBROUTINE COSQF(N, X, WSAVE)

INTEGER :: N
REAL(8), DIMENSION(:) :: X, WSAVE

SUBROUTINE COSQF_64(N, X, WSAVE)

INTEGER(8) :: N
REAL(8), DIMENSION(:) :: X, WSAVE




C INTERFACE
#include <sunperf.h>

void dcosqf(int n, double *x, double *wsave);

void dcosqf_64(long n, double *x, double *wsave);

Description

Oracle Solaris Studio Performance Library                           dcosqf(3P)



NAME
       dcosqf  - compute the Fourier coefficients in a cosine series represen-
       tation with only odd wave numbers.  The COSQ operations  are  unnormal-
       ized  inverses  of themselves, so a call to COSQF followed by a call to
       COSQB will multiply the input sequence by 4 * N.


SYNOPSIS
       SUBROUTINE DCOSQF(N, X, WSAVE)

       INTEGER N
       DOUBLE PRECISION X(*), WSAVE(*)

       SUBROUTINE DCOSQF_64(N, X, WSAVE)

       INTEGER*8 N
       DOUBLE PRECISION X(*), WSAVE(*)




   F95 INTERFACE
       SUBROUTINE COSQF(N, X, WSAVE)

       INTEGER :: N
       REAL(8), DIMENSION(:) :: X, WSAVE

       SUBROUTINE COSQF_64(N, X, WSAVE)

       INTEGER(8) :: N
       REAL(8), DIMENSION(:) :: X, WSAVE




   C INTERFACE
       #include <sunperf.h>

       void dcosqf(int n, double *x, double *wsave);

       void dcosqf_64(long n, double *x, double *wsave);



ARGUMENTS
       N (input) Length of the sequence to be transformed.  These  subroutines
                 are most efficient when N is a product of small primes.  N >=
                 0.


       X (input/output)
                 On entry, an array of length N containing the sequence to  be
                 transformed.   On  exit, the quarter-wave cosine transform of
                 the input.


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




                                  7 Nov 2015                        dcosqf(3P)