--- /dev/null
+function [p,e,t]=Ustructmesh_random(x,y,region,sides)
+
+% [p,e,t]=Ustructmesh(x,y,region,sides)
+
+% 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/>.
+
+x = sort(x);
+y = sort(y);
+
+nx = length(x);
+ny = length(y);
+[XX,YY] = meshgrid(x,y);
+p = [XX(:),YY(:)]';
+iiv (ny,nx)=0;
+iiv(:)=1:nx*ny;
+iiv(end,:)=[];
+iiv(:,end)=[];
+iiv=iiv(:)';
+
+niiv = length(iiv);
+theperm = iiv(randperm(niiv));
+first = theperm(1:floor(niiv/2));
+second = theperm(floor(niiv/2)+1:end);
+
+t = [[first;first+ny;first+ny+1],[first;first+ny+1;first+1] ];
+t = [t,[second;second+ny;second+1],[second+ny;second+ny+1;second+1] ];
+
+t (4,:)=region;
+
+l1 = 1+ny*([1:nx]-1);
+l4 = 1:ny;
+l2 = ny*(nx-1)+1:nx*ny;
+l3 = ny + l1 -1;
+
+e = [ l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])
+ l1([2:end]) l2([2:end]) l3([2:end]) l4([2:end])
+ [l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])]*0
+ [l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])]*0
+ l1([1:end-1])*0+sides(1) l2([1:end-1])*0+sides(2) l3([1:end-1])*0+sides(3) l4([1:end-1])*0+sides(4)
+ [l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])]*0
+ [l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])]*0+region
+ ];
+
+