1!
2!     CalculiX - A 3-dimensional finite element program
3!              Copyright (C) 1998-2021 Guido Dhondt
4!
5!     This program is free software; you can redistribute it and/or
6!     modify it under the terms of the GNU General Public License as
7!     published by the Free Software Foundation(version 2);
8!
9!
10!     This program is distributed in the hope that it will be useful,
11!     but WITHOUT ANY WARRANTY; without even the implied warranty of
12!     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13!     GNU General Public License for more details.
14!
15!     You should have received a copy of the GNU General Public License
16!     along with this program; if not, write to the Free Software
17!     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18!
19!     matrix preconditioning: used in dgmres.f
20!
21      subroutine msolve(n,r,z,nelt,ia,ja,a,isym,rwork,iwork)
22!
23      implicit none
24!
25      integer n,nelt,ia(*),ja(*),isym,iwork(*),i,nd
26!
27      real*8 r(*),z(*),a(*),rwork(*)
28!
29      do i=1,n
30         z(i)=r(i)*rwork(i)
31      enddo
32!
33      return
34      end
35