dcosqi(3P) Sun Performance Library dcosqi(3P)NAMEdcosqi - initialize the array WSAVE, which is used in both COSQF and
COSQB.
SYNOPSIS
SUBROUTINE DCOSQI(N, WSAVE)
INTEGER N
DOUBLE PRECISION WSAVE(*)
SUBROUTINE DCOSQI_64(N, WSAVE)
INTEGER*8 N
DOUBLE PRECISION WSAVE(*)
F95 INTERFACE
SUBROUTINE COSQI(N, WSAVE)
INTEGER :: N
REAL(8), DIMENSION(:) :: WSAVE
SUBROUTINE COSQI_64(N, WSAVE)
INTEGER(8) :: N
REAL(8), DIMENSION(:) :: WSAVE
C INTERFACE
#include <sunperf.h>
void dcosqi(int n, double *wsave);
void dcosqi_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/output)
On entry, an array of dimension (3 * N + 15) or greater.
DCOSQI needs to be called only once to initialize WSAVE
before calling DCOSQF and/or DCOSQB 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.
6 Mar 2009 dcosqi(3P)
