dezfti

NAME

dezfti - initializes the array WSAVE, which is used in both DEZFTF and DEZFTB.

SYNOPSIS

  SUBROUTINE DEZFTI( N, WSAVE)
  INTEGER N
  DOUBLE PRECISION WSAVE(*)
 
  SUBROUTINE DEZFTI_64( N, WSAVE)
  INTEGER*8 N
  DOUBLE PRECISION WSAVE(*)

F95 INTERFACE

  SUBROUTINE DEZFTI( N, WSAVE)
  INTEGER :: N
  REAL(8), DIMENSION(:) :: WSAVE
 
  SUBROUTINE DEZFTI_64( N, WSAVE)
  INTEGER(8) :: N
  REAL(8), DIMENSION(:) :: WSAVE

C INTERFACE

#include <sunperf.h>

void dezfti(int n, double *wsave);

void dezfti_64(long n, double *wsave);

ARGUMENTS

* N (input): Length of the sequence to be transformed. N >= 0.
* WSAVE (input): On entry, an array with a dimension of at least (3 * N + 15). The same work array can be used for both DEZFTF and DEZFTB 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 DEZFTF or DEZFTB as long as N and WSAVE remain unchanged, thus subsequent transforms can be obtained faster than the first.