Contents
dcosti - initialize the array WSAVE, which is used in COST.
SUBROUTINE DCOSTI(N, WSAVE)
INTEGER N
DOUBLE PRECISION WSAVE(*)
SUBROUTINE DCOSTI_64(N, WSAVE)
INTEGER*8 N
DOUBLE PRECISION WSAVE(*)
F95 INTERFACE
SUBROUTINE COSTI(N, WSAVE)
INTEGER :: N
REAL(8), DIMENSION(:) :: WSAVE
SUBROUTINE COSTI_64(N, WSAVE)
INTEGER(8) :: N
REAL(8), DIMENSION(:) :: WSAVE
C INTERFACE
#include <sunperf.h>
void dcosti(int n, double *wsave);
void dcosti_64(long n, double *wsave);
N (input) Length of the sequence to be transformed. The
method is most efficient when N - 1 is a product
of small primes. N >= 2.
WSAVE (input)
On entry, an array of dimension (3 * N + 15) or
greater. DCOSTI is called once to initialize
WSAVE before calling DCOST and need not be called
again between calls to DCOST if N and WSAVE remain
unchanged. Thus, subsequent transforms of same
size can be obtained faster than the first since
they do not require initialization of the
workspace.