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diff --git a/octave_packages/fpl-1.2.0/FPL2pdesurf.m b/octave_packages/fpl-1.2.0/FPL2pdesurf.m
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+## Copyright (C) 2004-2008,2009  Carlo de Falco, Massimiliano Culpo
+##
+##  This file is part of 
+##
+##                   FPL - Fem PLotting package for octave
+## 
+##  FPL 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.
+## 
+##  FPL 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 FPL; If not, see <http://www.gnu.org/licenses/>.
+##
+##
+##  AUTHORS:
+##  Carlo de Falco <cdf _AT_ users.sourceforge.net>
+##
+##  Culpo Massimiliano
+##  Bergische Universitaet Wuppertal
+##  Fachbereich C - Mathematik und Naturwissenschaften
+##  Arbeitsgruppe fuer Angewandte MathematD-42119 Wuppertal  Gaussstr. 20 
+##  D-42119 Wuppertal, Germany
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} FPL2pdesurf (@var{mesh}, @
+## @var{u} [ @var{property}, @var{value} ...])
+## 
+## plots the scalar field @var{u}
+## defined on the triangulation @var{mesh} using opendx.
+##
+## options (default value):
+## @itemize @minus
+## @item data_dep ("positions") defines wether data depends on
+## positions or connections
+## @item plot_field ("scalar") defines wether to plot the scalar field
+## itself or its gradient
+## @end itemize
+##
+## @seealso{MSH2Mgmsh, MSH2Mstructmesh}
+## @end deftypefn
+ 
+function FPL2pdesurf(varargin)
+
+  data_dep   = "positions";
+  plot_field = "scalar";
+
+  if nargin == 1
+    FPL2showmesh(varargin{1}); 
+  elseif nargin == 2
+    mesh = varargin{1};
+    u = varargin{2};
+  elseif ( (nargin > 2) && (rem(nargin,2)==0) )
+    mesh = varargin{1};
+    u = varargin{2};
+    for ii=3:2:nargin
+      eval([ varargin{ii} " = """ varargin{ii+1} """;" ]);
+    endfor
+  else  
+    keyboard ,error(["wrong number of parameters " num2str (nargin)])
+  endif
+
+  dataname = mktemp("/tmp",".dx");
+  scriptname = mktemp("/tmp",".net");
+
+  FPL2dxoutputdata(dataname,mesh.p,mesh.t,u,'u',0,1,1);
+
+  switch plot_field
+    case {"scalar","scal"}
+      showmesh = file_in_path(path,"FPL2coloredrubbersheet.net");
+    case {"gradient","grad"}
+      showmesh = file_in_path(path,"FPL2coloredgradient.net");
+    otherwise
+      error ([ "incorrect value " plot_field " for option plot_field "])
+  endswitch
+
+  system (["cp " showmesh " " scriptname]);
+  system (["sed -i \'s|__FILE__DX__|" dataname "|g\' " scriptname]);
+
+  switch data_dep
+    case {"positions","continuous","interpolate","P1"}
+      system (["sed -i \'s|__DATA_DEPENDENCY__|positions|g\' " scriptname]);
+    case {"connections","discontinuous","P0"}
+      system (["sed -i \'s|__DATA_DEPENDENCY__|positions|g\' " scriptname]);
+    otherwise 
+      error ([ "incorrect value " data_dep " for option data_dep "])
+  endswitch
+
+  ##command = ["dx -noConfirmedQuit  -noImageRWNetFile -program " scriptname " -execute -image  >& /dev/null & "];
+  command  = ["dx -noConfirmedQuit  -program " scriptname " -execute -image  >& /dev/null & "];
+  
+  system(command);
+
+endfunction 
+
+function filename = mktemp (direct,ext);
+
+  if (~exist(direct,"dir"))
+    error("trying to save temporary file to non existing directory")
+  endif
+
+  done=false;
+
+  while ~done
+    filename = [direct,"/FPL.",num2str(floor(rand*1e7)),ext];
+    if ~exist(filename,"file")
+      done =true;
+    endif
+  endwhile
+  
+endfunction
+
+%!shared msh
+%!demo
+%! msh.p = [0 0; 1 0; 1 1; 0 1].';
+%! msh.t = [1 2 3 1; 1 3 4 1].';
+%! msh.e = [1 2 0 0 1 0 1; 2 3 0 0 2 0 1; 3 4 0 0 3 0 1; 4 1 0 0 4 0 1].';
+%! u = [0 1].';
+%! FPL2pdesurf (msh, u, "data_dep", "connections");
+%! s = input ("do you see a square divided into two triangles with a diagonal red-to-blue gradient color (if you see an empty plot try ctrl-F)? (y/n): " ,"s");
+%! assert(s, "y")
+%!demo
+%! v = [0 0 1 1].';
+%! FPL2pdesurf (msh, v);
+%! s = input ("do you see a square divided into two triangles with a vertical red-to-blue gradient color (if you see an empty plot try ctrl-F)? (y/n): " ,"s");