cost - compute the discrete Fourier cosine transform of an even sequence. The COST transforms are unnormalized inverses of themselves, so a call of COST followed by another call of COST will multiply the input sequence by 2 * (N-1).
SUBROUTINE COST( N, X, WSAVE) INTEGER N REAL X(*), WSAVE(*)
SUBROUTINE COST_64( N, X, WSAVE) INTEGER*8 N REAL X(*), WSAVE(*)
SUBROUTINE COST( N, X, WSAVE) INTEGER :: N REAL, DIMENSION(:) :: X, WSAVE
SUBROUTINE COST_64( N, X, WSAVE) INTEGER(8) :: N REAL, DIMENSION(:) :: X, WSAVE
#include <sunperf.h>
void cost(int n, float *x, float *wsave);
void cost_64(long n, float *x, float *wsave);