Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / secs2d-0.0.8 / Utilities / Updegrad.m

diff --git a/octave_packages/secs2d-0.0.8/Utilities/Updegrad.m b/octave_packages/secs2d-0.0.8/Utilities/Updegrad.m
new file mode 100644 (file)
index 0000000..5f562c4
--- /dev/null
+++ b/octave_packages/secs2d-0.0.8/Utilities/Updegrad.m
@@ -0,0 +1,39 @@
+function [Fx,Fy]=Updegrad(mesh,F);
+
+% [Fx,Fy]=Updegrad(mesh,F);
+%
+% computes piecewise constant
+% gradient of a piecewise linear
+% scalar function F defined on
+% the mesh structure described by mesh
+
+
+
+% This file is part of 
+%
+%            SECS2D - A 2-D Drift--Diffusion Semiconductor Device Simulator
+%         -------------------------------------------------------------------
+%            Copyright (C) 2004-2006  Carlo de Falco
+%
+%
+%
+%  SECS2D is free software; you can redistribute it and/or modify
+%  it under the terms of the GNU General Public License as published by
+%  the Free Software Foundation; either version 2 of the License, or
+%  (at your option) any later version.
+%
+%  SECS2D is distributed in the hope that it will be useful,
+%  but WITHOUT ANY WARRANTY; without even the implied warranty of
+%  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+%  GNU General Public License for more details.
+%
+%  You should have received a copy of the GNU General Public License
+%  along with SECS2D; If not, see <http://www.gnu.org/licenses/>.
+
+
+
+
+shgx = reshape(mesh.shg(1,:,:),3,[]);
+Fx = sum(shgx.*F(mesh.t(1:3,:)),1);
+shgy = reshape(mesh.shg(2,:,:),3,[]);
+Fy = sum(shgy.*F(mesh.t(1:3,:)),1);