vdsint(3P) Sun Performance Library vdsint(3P)NAMEvdsint - compute the discrete Fourier sine transform of an odd
sequence. The VSINT transforms are unnormalized inverses of them‐
selves, so a call of VSINT followed by another call of VSINT will mul‐
tiply the input sequence by 2 * (N+1). The VSINT transforms are nor‐
malized, so a call of VSINT followed by a call of VSINT will return the
original sequence.
SYNOPSIS
SUBROUTINE VDSINT(M, N, X, XT, MDIMX, WSAVE)
INTEGER M, N, MDIMX
DOUBLE PRECISION X(MDIMX,*), XT(MDIMX,*), WSAVE(*)
SUBROUTINE VDSINT_64(M, N, X, XT, MDIMX, WSAVE)
INTEGER*8 M, N, MDIMX
DOUBLE PRECISION X(MDIMX,*), XT(MDIMX,*), WSAVE(*)
F95 INTERFACE
SUBROUTINE SINT([M], [N], X, XT, [MDIMX], WSAVE)
INTEGER :: M, N, MDIMX
REAL(8), DIMENSION(:) :: WSAVE
REAL(8), DIMENSION(:,:) :: X, XT
SUBROUTINE SINT_64([M], [N], X, XT, [MDIMX], WSAVE)
INTEGER(8) :: M, N, MDIMX
REAL(8), DIMENSION(:) :: WSAVE
REAL(8), DIMENSION(:,:) :: X, XT
C INTERFACE
#include <sunperf.h>
void vdsint(int m, int n, double *x, double *xt, int mdimx, double
*wsave);
void vdsint_64(long m, long n, double *x, double *xt, long mdimx, dou‐
ble *wsave);
ARGUMENTS
M (input)
The number of sequences to be transformed. M >= 0.
N (input) Length of the sequence to be transformed. These subroutines
are most efficient when N+1 is a product of small primes. N
>= 0.
X (input/output)
On entry, a real two-dimensional array with dimensions of
(MDIMX x (N+1)) whose rows contain the sequences to be trans‐
formed. On exit, the sine transform of the input.
XT (input/output)
A real two-dimensional work array with dimensions of (MDIMX x
(N+1)).
MDIMX (input)
Leading dimension of the arrays X and XT as specified in a
dimension or type statement. MDIMX >= M.
WSAVE (input)
On entry, an array with dimension of at least int(2.5 * N +
15) initialized by VSINTI.
6 Mar 2009 vdsint(3P)
