Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• ARGUMENTS

NAME

     cosqf - compute the Fourier coefficients in a cosine  series
     representation  with only odd wave numbers.  The COSQ opera-
     tions 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 COSQF(N, X, WSAVE)

     INTEGER N
     REAL X(*), WSAVE(*)

     SUBROUTINE COSQF_64(N, X, WSAVE)

     INTEGER*8 N
     REAL X(*), WSAVE(*)

  F95 INTERFACE
     SUBROUTINE COSQF(N, X, WSAVE)

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

     SUBROUTINE COSQF_64(N, X, WSAVE)

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

  C INTERFACE
     #include <sunperf.h>

     void cosqf(int n, float *x, float *wsave);

     void cosqf_64(long n, float *x, float *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 COSQI.