vdcosqi(3P) Sun Performance Library vdcosqi(3P)NAMEvdcosqi - 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/output)
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.
6 Mar 2009 vdcosqi(3P)
