Contents
vcosqi - initialize the array WSAVE, which is used in both
VCOSQF and VCOSQB.
SUBROUTINE VCOSQI(N, WSAVE)
INTEGER N
REAL WSAVE(*)
SUBROUTINE VCOSQI_64(N, WSAVE)
INTEGER*8 N
REAL WSAVE(*)
F95 INTERFACE
SUBROUTINE VCOSQI(N, WSAVE)
INTEGER :: N
REAL, DIMENSION(:) :: WSAVE
SUBROUTINE VCOSQI_64(N, WSAVE)
INTEGER(8) :: N
REAL, DIMENSION(:) :: WSAVE
C INTERFACE
#include <sunperf.h>
void vcosqi(int n, float *wsave);
void vcosqi_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 (2 * N + 15) or
greater. VCOSQI needs to be called only once to
initialize WSAVE before calling VCOSQF and/or
VCOSQB 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.