LUdecomp.F

#include "iadefines.h"
c**********************************************************************
#include "author.inc"
c*    $Id: LUdecomp.F,v 1.8 1996/04/24 19:14:35 turner Exp $
c*
c*    Compute the LU decomposition of a matrix.
c*
c*    <PARAMETER LIST>
c*
c*     Input:
c*      ia - integer vector containing info about how "a" is stored
c*        NOTE: see description of ia below
c*      ja - column map for matrix
c*
c*     In/Out:
c*      a - matrix to be factored
c*
c*     Output:
c*      status - return status
c*        -4  ==>  breakdown
c*        -3  ==>  internal error
c*        -1  ==>  invalid argument(s)
c*         0  ==>  success
c*
#include "iadesc.inc"
c*
c*    <SUBROUTINES REQUIRED>
c*
c*     JT_LUdecomp_Full  for A stored in full conventional format
c*
#include "copyright.inc"
c**********************************************************************
      subroutine JT_LUdecomp (a, ia, ja, status)
      implicit none
c
c ... Input:
      integer ia(_JT_no_of_storage_parameters_), ja(*)
c
c ... In/Out:
      real a(*)
c
c ... Output:
      integer status
c
      if (ia(_JT_storage_) .eq. _JT_storage_full_) then
       call JT_LUdecomp_Full (ia(_JT_idim_), ia(_JT_nrows_), a, status)
      else
       status = -1
       return
      endif
c
      if (status .eq. -1) status = -3
c
      return
      end