• NAME
• SYNOPSIS
• F95 INTERFACE
• C INTERFACE
• ARGUMENTS

NAME

vdsinqi - initialize the array WSAVE, which is used in both VSINQF and VSINQB.

SYNOPSIS

  SUBROUTINE VDSINQI( N, WSAVE)
  INTEGER N
  DOUBLE PRECISION WSAVE(*)

  SUBROUTINE VDSINQI_64( N, WSAVE)
  INTEGER*8 N
  DOUBLE PRECISION WSAVE(*)

F95 INTERFACE

  SUBROUTINE VSINQI( N, WSAVE)
  INTEGER :: N
  REAL(8), DIMENSION(:) :: WSAVE

  SUBROUTINE VSINQI_64( N, WSAVE)
  INTEGER(8) :: N
  REAL(8), DIMENSION(:) :: WSAVE

C INTERFACE

#include <sunperf.h>

void vdsinqi(int n, double *wsave);

void vdsinqi_64(long n, double *wsave);

ARGUMENTS

• N (input)
  Length of the sequence to be transformed. The method is most efficient when N is a product of small primes.

• WSAVE (input/output)
  On entry, an array with a dimension of at least (2 * N + 15). The same work array can be used for both VSINQF and VSINQB as long as N remains unchanged. Different WSAVE arrays are required for different values of N. This initialization does not have to be repeated between calls to VSINQF or VSINQB as long as N and WSAVE remain unchanged, thus subsequent transforms can be obtained faster than the first.