dsinqb(3P) Sun Performance Library dsinqb(3P)NAMEdsinqb - synthesize a Fourier sequence from its representation in terms
of a sine series with odd wave numbers. The SINQ operations are unnor‐
malized inverses of themselves, so a call to SINQF followed by a call
to SINQB will multiply the input sequence by 4 * N.
SYNOPSIS
SUBROUTINE DSINQB(N, X, WSAVE)
INTEGER N
DOUBLE PRECISION X(*), WSAVE(*)
SUBROUTINE DSINQB_64(N, X, WSAVE)
INTEGER*8 N
DOUBLE PRECISION X(*), WSAVE(*)
F95 INTERFACE
SUBROUTINE SINQB([N], X, WSAVE)
INTEGER :: N
REAL(8), DIMENSION(:) :: X, WSAVE
SUBROUTINE SINQB_64([N], X, WSAVE)
INTEGER(8) :: N
REAL(8), DIMENSION(:) :: X, WSAVE
C INTERFACE
#include <sunperf.h>
void dsinqb(int n, double *x, double *wsave);
void dsinqb_64(long n, double *x, double *wsave);
ARGUMENTS
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, an array of length N containing the sequence to be
transformed. On exit, the quarter-wave sine synthesis of the
input.
WSAVE (input)
On entry, an array with dimension of at least (3 * N + 15)
for scalar subroutines, initialized by SINQI.
6 Mar 2009 dsinqb(3P)
