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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);
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