vdsinqb(3P) Sun Performance Library vdsinqb(3P)NAMEvdsinqb - synthesize a Fourier sequence from its representation in
terms of a sine series with odd wave numbers. The VSINQ operations are
normalized, so a call of VSINQF followed by a call of VSINQB will
return the original sequence.
SYNOPSIS
SUBROUTINE VDSINQB(M, N, X, XT, MDIMX, WSAVE)
INTEGER M, N, MDIMX
DOUBLE PRECISION X(MDIMX,*), XT(MDIMX,*), WSAVE(*)
SUBROUTINE VDSINQB_64(M, N, X, XT, MDIMX, WSAVE)
INTEGER*8 M, N, MDIMX
DOUBLE PRECISION X(MDIMX,*), XT(MDIMX,*), WSAVE(*)
F95 INTERFACE
SUBROUTINE SINQB([M], [N], X, XT, [MDIMX], WSAVE)
INTEGER :: M, N, MDIMX
REAL(8), DIMENSION(:) :: WSAVE
REAL(8), DIMENSION(:,:) :: X, XT
SUBROUTINE SINQB_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 vdsinqb(int m, int n, double *x, double *xt, int mdimx, double
*wsave);
void vdsinqb_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 is a product of small primes. N >=
0.
X (input/output)
On entry, a real two- dimensional array with dimensions of
(MDIMX x N) whose rows contain the sequences to be trans‐
formed. On exit, the quarter-wave sine synthesis of the
input.
XT (input)
A real two-dimensional work array with dimensions of (MDIMX x
N).
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 (2 * N + 15)
for vector subroutines, initialized by VSINQI.
6 Mar 2009 vdsinqb(3P)
