y_eq_diagAx.F

#include "iadefines.h"
c**********************************************************************
#include "author.inc"
c*    $Id: y_eq_diagAx.F,v 1.6 1996/04/24 19:15:12 turner Exp $
c*
c*    Compute y = diag(A)*x.
c*
c*    <PARAMETER LIST>
c*
c*     Input:
c*      x - vector to be multiplied
c*      a - matrix
c*      ia - integer vector containing info about how "a" is stored
c*        NOTE: see description of ia below
c*      ja - column index array for a
c*
c*     Output:
c*      y - destination vector
c*      status - return status
c*        -1  ==>  invalid argument(s)
c*         0  ==>  success
c*
c*    <SUBROUTINES REQUIRED>
c*
c*     JT_y_eq_diagAx_Full
c*     JT_z_eq_yx
c*
#include "iadesc.inc"
c*
#include "copyright.inc"
c**********************************************************************
      subroutine JT_y_eq_diagAx (x, a, ia, ja, y, status)
      implicit none
c
c ... Input:
      integer ia(_JT_no_of_storage_parameters_), ja(*)
      real x(*), a(*)
c
c ... Output:
      integer status
      real y(*)
c
      if (ia(_JT_storage_) .eq. 1) then
       call JT_y_eq_diagAx_Full (ia(_JT_idim_), ia(_JT_nrows_), x, a, y, status)
      elseif (ia(_JT_storage_).eq.8 .or.
     &        ia(_JT_storage_).eq.10 .or.
     &        ia(_JT_storage_).eq.11 .or.
     &        ia(_JT_storage_).eq.12) then
       call JT_z_eq_yx (ia(_JT_nrows_), a, x, y, status)
      else
       status = -1
      endif
c
      return
      end
c**********************************************************************
#include "author.inc"
c*
c*    Compute y = inv(diag(A))*x.
c*
c*    <PARAMETER LIST>
c*
c*     Input:
c*      x - vector to be multiplied
c*      a - matrix
c*      ia - integer vector containing info about how "a" is stored
c*        NOTE: see description of ia below
c*      ja - column index array for a
c*
c*     Output:
c*      y - destination vector
c*      status - return status
c*        -1  ==>  invalid argument(s)
c*         0  ==>  success
c*
c*    <SUBROUTINES REQUIRED>
c*
c*     JT_y_eq_invdiagAx_Full
c*     JT_z_eq_y_div_x
c*
#include "iadesc.inc"
c*
#include "copyright.inc"
c**********************************************************************
      subroutine JT_y_eq_invdiagAx (x, a, ia, ja, y, status)
      implicit none
c
c ... Input:
      integer ia(_JT_no_of_storage_parameters_), ja(*)
      real x(*), a(*)
c
c ... Output:
      integer status
      real y(*)
c
      if (ia(_JT_storage_) .eq. _JT_storage_full_) then
       call JT_y_eq_invdiagAx_Full (ia(_JT_idim_), ia(_JT_nrows_), x, a, y, status)
      elseif (ia(_JT_storage_).eq._JT_storage_ELL_ .or.
     &        ia(_JT_storage_).eq._JT_storage_COO_ .or.
     &        ia(_JT_storage_).eq._JT_storage_RSS_ .or.
     &        ia(_JT_storage_).eq._JT_storage_CSS_) then
       call JT_z_eq_y_div_x (ia(_JT_nrows_), a, x, y, status)
      else
       status = -1
      endif
c
      return

      end