NAME

SYNOPSIS

  SUBROUTINE VDCOSTI( N, WSAVE)
  INTEGER N
  DOUBLE PRECISION WSAVE(*)
 
  SUBROUTINE VDCOSTI_64( N, WSAVE)
  INTEGER*8 N
  DOUBLE PRECISION WSAVE(*)
 

F95 INTERFACE

  SUBROUTINE VCOSTI( N, WSAVE)
  INTEGER :: N
  REAL(8), DIMENSION(:) :: WSAVE
 
  SUBROUTINE VCOSTI_64( N, WSAVE)
  INTEGER(8) :: N
  REAL(8), DIMENSION(:) :: WSAVE
 

C INTERFACE

void vdcosti(int n, double *wsave);

void vdcosti_64(long n, double *wsave);

ARGUMENTS

* N (input)

Length of the sequence to be transformed. The method is most efficient when N - 1 is a product of small primes. N >= 2.

* WSAVE (input)

On entry, an array of dimension (2 * N + 15) or greater. VDCOSTI is called once to initialize WSAVE before calling VDCOST and need not be called again between calls to VDCOST if N and WSAVE remain unchanged. Thus, subsequent transforms of same size can be obtained faster than the first since they do not require initialization of the workspace.