dcosqb (3p)

Name

dcosqb - synthesize a Fourier sequence from its representation in terms of a cosine series with odd wave numbers. The COSQ operations are unnormalized inverses of themselves, so a call to COSQF followed by a call to COSQB will multiply the input sequence by 4 * N.

Synopsis

SUBROUTINE DCOSQB(N, X, WSAVE)

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

SUBROUTINE DCOSQB_64(N, X, WSAVE)

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




F95 INTERFACE
SUBROUTINE COSQB(N, X, WSAVE)

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

SUBROUTINE COSQB_64(N, X, WSAVE)

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




C INTERFACE
#include <sunperf.h>

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

void dcosqb_64(long n, double *x, double *wsave);

Description

Oracle Solaris Studio Performance Library                           dcosqb(3P)



NAME
       dcosqb - synthesize a Fourier sequence from its representation in terms
       of a cosine series with odd wave  numbers.   The  COSQ  operations  are
       unnormalized  inverses  of themselves, so a call to COSQF followed by a
       call to COSQB will multiply the input sequence by 4 * N.


SYNOPSIS
       SUBROUTINE DCOSQB(N, X, WSAVE)

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

       SUBROUTINE DCOSQB_64(N, X, WSAVE)

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




   F95 INTERFACE
       SUBROUTINE COSQB(N, X, WSAVE)

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

       SUBROUTINE COSQB_64(N, X, WSAVE)

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




   C INTERFACE
       #include <sunperf.h>

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

       void dcosqb_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 synthesis 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                        dcosqb(3P)