Contents
cosqi - initialize the array WSAVE, which is used in both
COSQF and COSQB.
SUBROUTINE COSQI(N, WSAVE)
INTEGER N
REAL WSAVE(*)
SUBROUTINE COSQI_64(N, WSAVE)
INTEGER*8 N
REAL WSAVE(*)
F95 INTERFACE
SUBROUTINE COSQI(N, WSAVE)
INTEGER :: N
REAL, DIMENSION(:) :: WSAVE
SUBROUTINE COSQI_64(N, WSAVE)
INTEGER(8) :: N
REAL, DIMENSION(:) :: WSAVE
C INTERFACE
#include <sunperf.h>
void cosqi(int n, float *wsave);
void cosqi_64(long n, float *wsave);
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 (3 * N + 15) or
greater. COSQI needs to be called only once to
initialize WSAVE before calling COSQF and/or COSQB
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 initiali-
zation of the workspace.