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diff --git a/octave_packages/ocs-0.1.3/sbn/Mdiode.m b/octave_packages/ocs-0.1.3/sbn/Mdiode.m
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+## Copyright (C) 2006,2007,2008  Massimiliano Culpo, Carlo de Falco            
+##
+## This file is part of:
+## OCS - A Circuit Simulator for Octave
+##
+## OCS 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.
+##
+## This program 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 this program (see the file LICENSE); if not,
+## see <http://www.gnu.org/licenses/>.
+##
+## author: culpo@math.uni-wuppertal.de, Carlo de Falco <cdf _AT_ users.sourceforge.net> 
+
+## -*- texinfo -*-
+##
+## @deftypefn{Function File} @
+## {[@var{a},@var{b},@var{c}]=}Mdiode(@var{string},@var{parameters},@
+## @var{parameternames},@var{extvar},@var{intvar},@var{t})
+##
+## SBN file implementing models for diodes.
+##
+## @var{string} is used to select among models. Parameters are listed
+## as inner items. Possible models are:
+##
+## @itemize @minus
+## @item @var{string} = "simple" (Usual exponential diode model)
+## @itemize @minus
+## @item Is   -> reverse current
+## @item Vth  -> thermal voltage
+## @item Rpar -> parasitic resistance
+## @end itemize
+## @item @var{string} = "PDEsymmetric" (Drift-Diffusion PDE model)
+## @itemize @minus
+## @item len    -> diode length
+## @item Nnodes -> number of nodes of 1D grid
+## @item Dope   -> doping (abrupt and symmetric)
+## @item toll   -> absolute tolerance
+## @item maxit  -> max iterations number
+## @item Area   -> device area
+## @end itemize
+## @end itemize
+##
+## See the @cite{IFF file format specifications} for details about 
+## the output structures.
+##
+## @seealso{prs_iff,asm_initialize_system,asm_build_system}
+## @end deftypefn
+
+function [a,b,c] = Mdiode (string,parameters,parameternames,extvar,intvar,t)
+
+  switch string 
+      
+    case "simple"
+      Is = 1e-14;
+      Vth = 2.5e-2;
+      Rpar = 1e12;
+      for ii=1:length(parameternames)
+	eval([parameternames{ii} "=" num2str(parameters(ii)) ";"])	
+      endfor
+      
+      vp = extvar(1);
+      vm = extvar(2);
+
+      I = Is*(exp((vp - vm)/Vth) -1 ) + (vp - vm)/Rpar;
+      geq = Is*exp((vp - vm)/Vth)/Vth + 1/Rpar;
+
+      a = zeros(2);
+      b = [geq -geq; -geq geq];
+      c = [I ; -I] ;
+      break
+
+    case "PDEsymmetric"
+
+      len = 1e-6;
+      Nnodes = 100;
+      Dope=1e23;
+      
+      toll  = 1e-5;
+      maxit = 100;
+      ptoll  = 1e-10;
+      pmaxit = 100;
+
+      Area   = 1e-10;
+
+      for ii=1:length(parameternames)
+	eval([parameternames{ii} "=" num2str(parameters(ii)) ";"])	
+      endfor
+
+      vp = extvar(1);
+      vm = extvar(2);
+      
+      [I,g] = Mpdesympnjunct (len,Dope,vp-vm,Area,Nnodes,toll,maxit,ptoll,pmaxit);
+      
+      a = zeros(2);
+      b = [g -g; -g g];
+      c = [I ; -I] ;
+      
+      break
+
+    otherwise
+      error(["unknown section:" string])
+  endswitch
+
+endfunction