Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / secs1d-0.0.8 / Utilities / Ucomplap.m

diff --git a/octave_packages/secs1d-0.0.8/Utilities/Ucomplap.m b/octave_packages/secs1d-0.0.8/Utilities/Ucomplap.m
new file mode 100644 (file)
index 0000000..50fa286
--- /dev/null
+++ b/octave_packages/secs1d-0.0.8/Utilities/Ucomplap.m
@@ -0,0 +1,43 @@
+function L = Ucomplap (nodes,Nnodes,elements,Nelements,coeff)
+
+% L = Ucomplap (nodes,Nnode,elements,Nelements,coeff)
+%    Computes the P1 finite element approximation of the 
+%    differential operator - d ( coeff d (.)\dx)\dx
+
+ ## This file is part of 
+  ##
+  ## SECS1D - A 1-D Drift--Diffusion Semiconductor Device Simulator
+  ## -------------------------------------------------------------------
+  ## Copyright (C) 2004-2007  Carlo de Falco
+  ##
+  ##
+  ##
+  ##  SECS1D 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.
+  ##
+  ##  SECS1D 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 SECS1D; If not, see <http://www.gnu.org/licenses/>.
+  
+  h    = nodes(2:end)-nodes(1:end-1);
+  
+  d0   = [ coeff(1)./h(1); 
+            (coeff(1:end-1)./h(1:end-1))+(coeff(2:end)./h(2:end));
+            coeff(end)./h(end)];
+  
+  d1   = [1000; -coeff./h];
+  dm1  = [ -coeff./h;1000];
+  
+  L    = spdiags([dm1, d0, d1],-1:1,Nnodes,Nnodes);
+  
+  
+  % Last Revision:
+  % $Author: adb014 $
+  % $Date: 2008-02-04 16:26:27 +0100 (man, 04 feb 2008) $
+