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      subroutine extrapol_tel2(ipnei,neifa,vfa,area,xxna,volume,gradtel,
20     &  nefa,nefb,ncfd)
21!
22!     calculate the gradient of the temperature at the center of
23!     the elements
24!
25      implicit none
26!
27      integer ipnei(*),neifa(*),nefa,nefb,ifa,i,l,indexf,ncfd
28!
29      real*8 vfa(0:7,*),area(*),xxna(3,*),volume(*),gradtel(3,*)
30!
31!
32!
33      do i=nefa,nefb
34!
35!        initialization
36!
37         do l=1,ncfd
38            gradtel(l,i)=0.d0
39         enddo
40!
41         do indexf=ipnei(i)+1,ipnei(i+1)
42            ifa=neifa(indexf)
43            do l=1,ncfd
44               gradtel(l,i)=gradtel(l,i)+
45     &              vfa(0,ifa)*xxna(l,indexf)
46            enddo
47         enddo
48!
49!        dividing by the volume of the element
50!
51         do l=1,ncfd
52            gradtel(l,i)=gradtel(l,i)/volume(i)
53         enddo
54      enddo
55!
56      return
57      end
58