Contents

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

NAME

     costi - initialize the array WSAVE, which is used in COST.

SYNOPSIS

     SUBROUTINE COSTI(N, WSAVE)

     INTEGER N
     REAL WSAVE(*)

     SUBROUTINE COSTI_64(N, WSAVE)

     INTEGER*8 N
     REAL WSAVE(*)

  F95 INTERFACE
     SUBROUTINE COSTI(N, WSAVE)

     INTEGER :: N
     REAL, DIMENSION(:) :: WSAVE

     SUBROUTINE COSTI_64(N, WSAVE)

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

  C INTERFACE
     #include <sunperf.h>

     void costi(int n, float *wsave);

     void costi_64(long n, float *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 (3 * N  +  15)  or
               greater.  COSTI is called once to initialize WSAVE
               before calling COST and need not be  called  again
               between  calls  to  COST  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.