Contents

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

NAME

     vdcosqi - initialize the array WSAVE, which is used in  both
     VCOSQF and VCOSQB.

SYNOPSIS

     SUBROUTINE VDCOSQI(N, WSAVE)

     INTEGER N
     DOUBLE PRECISION WSAVE(*)

     SUBROUTINE VDCOSQI_64(N, WSAVE)

     INTEGER*8 N
     DOUBLE PRECISION WSAVE(*)

  F95 INTERFACE
     SUBROUTINE VCOSQI(N, WSAVE)

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

     SUBROUTINE VCOSQI_64(N, WSAVE)

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

  C INTERFACE
     #include <sunperf.h>

     void vdcosqi(int n, double *wsave);

     void vdcosqi_64(long n, double *wsave);

ARGUMENTS

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

     WSAVE (input)
               On entry, an array of dimension (2 * N  +  15)  or
               greater.   VDCOSQI needs to be called only once to
               initialize WSAVE  before  calling  VDCOSQF  and/or
               VDCOSQB  if  N  and WSAVE remain unchanged between
               these  calls.   Thus,  subsequent  transforms   or
               inverse  transforms  of  same size can be obtained
               faster than the first since they  do  not  require
               initialization of the workspace.