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diff --git a/octave_packages/fpl-1.2.0/fpl_vtk_write_field.m b/octave_packages/fpl-1.2.0/fpl_vtk_write_field.m
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+##  Copyright (C) 2006,2007,2008,2009,2010  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/>.
+##
+##  author: Carlo de Falco     <cdf _AT_ users.sourceforge.net>
+##  author: Massimiliano Culpo <culpo _AT_ users.sourceforge.net>
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} fpl_vtk_write_field (@var{basename}, @
+## @var{mesh}, @var{nodedata},  @var{celldata}, @var{endfile})
+## 
+## Output data field in serial XML-VTK UnstructuredGrid format.
+##
+## @var{basename} is a string containing the base-name of the (vtu) file
+## where the data will be saved.
+##
+## @var{mesh} is a PDE-tool like mesh, like the ones generated by the
+## "msh" package.
+##
+## @var{nodedata} and @var{celldata} are (Ndata x 2) cell arrays containing
+## respectively <PointData> and <CellData> representing scalars or
+## vectors:
+## @itemize @minus
+## @item @var{*data}@{:,1@} = variable data;
+## @item @var{*data}@{:,2@} = variable names;
+## @end itemize
+##
+## @var{endfile} should be 0 if you want to add other variables to the
+## same file, 1 otherwise.
+##
+## Example:
+## @example
+## <generate msh1, node centered field nc1, cell centered field cc1>
+## fpl_vtk_write_field("example",msh1,@{nc1, "temperature"@},@
+## @{cc1, "density"@},0);
+## <generate msh2, node centered field nc2>
+## fpl_vtk_write_field("example",msh2,@{nc2, "temperature"@},@
+## @{@},1);
+## @end example
+## will generate a valid XML-VTK UnstructuredGrid file.
+##
+## @seealso{fpl_dx_write_field, fpl_dx_write_series} 
+##
+## @end deftypefn
+
+function fpl_vtk_write_field(basename,mesh,nodedata,celldata,endfile)
+
+  ## Check input
+  if nargin!=5
+    error("fpl_vtk_write_field: wrong number of input");
+  endif
+
+  if !ischar(basename)
+    error("fpl_vtk_write_field: basename should be a valid string");
+  elseif !( isstruct(mesh) )
+    error("fpl_vtk_write_field: mesh should be a valid structure");
+  elseif !(iscell(nodedata) && iscell(celldata))
+    error("fpl_vtk_write_field: nodedata and celldata should be a valid cells");
+  endif
+
+  filename = [basename ".vtu"];
+
+  if ! exist(filename,"file")
+    fid = fopen (filename,"w");
+    ## Header
+    fprintf (fid,"<?xml version=""1.0""?>\n");
+    fprintf (fid,"<VTKFile type=""UnstructuredGrid"" version=""0.1"" byte_order=""LittleEndian"">\n");
+    fprintf (fid,"<UnstructuredGrid>\n");
+  else
+    ## FIXME: the following should be performed in a cleaner way! Does a
+    ## backward fgetl function exist?
+
+    ## If file exist, check if it was already closed
+    fid = fopen (filename,"r");
+    fseek(fid,-10,SEEK_END);
+    tst = fgetl(fid);
+    if strcmp(tst,"</VTKFile>")
+      error("fpl_vtk_write_field: file %s exist and was already closed",filename);
+    endif
+    fclose(fid);
+    fid = fopen (filename,"a");
+  endif    
+
+  p   = mesh.p;
+  dim = rows(p); # 2D or 3D
+
+  if dim == 2
+    t = mesh.t(1:3,:);
+  elseif dim == 3
+    t = mesh.t(1:4,:);
+  else
+    error("fpl_vtk_write_field: neither 2D triangle nor 3D tetrahedral mesh");    
+  endif
+  
+  t -= 1;
+  
+  nnodes = columns(p);
+  nelems = columns(t);
+
+  ## Header for <Piece>
+  fprintf (fid,"<Piece NumberOfPoints=""%d"" NumberOfCells=""%d"">\n",nnodes,nelems);
+  ## Print grid
+  print_grid(fid,dim,p,nnodes,t,nelems);
+  ## Print PointData
+  print_data_points(fid,nodedata,nnodes)
+  print_cell_data  (fid,celldata,nelems)
+  ## Footer for <Piece>
+  fprintf (fid, "</Piece>\n");
+
+  if (endfile)
+    ## Footer
+    fprintf (fid, "</UnstructuredGrid>\n");
+    fprintf (fid, "</VTKFile>");
+  endif
+
+  fclose (fid);
+	   
+endfunction
+
+## Print Points and Cells Data
+function print_grid(fid,dim,p,nnodes,t,nelems)
+  
+  if dim == 2
+    p      = [p; zeros(1,nnodes)];
+    eltype = 5;
+  else
+    eltype = 10;
+  endif
+  
+  ## VTK-Points (mesh nodes)
+  fprintf (fid,"<Points>\n");
+  fprintf (fid,"<DataArray type=""Float64"" Name=""Array"" NumberOfComponents=""3"" format=""ascii"">\n");  
+  fprintf (fid,"%g %g %g\n", p);
+  fprintf (fid,"</DataArray>\n");
+  fprintf (fid,"</Points>\n");
+
+  ## VTK-Cells (mesh elements)
+  fprintf (fid, "<Cells>\n");
+  fprintf (fid, "<DataArray type=""Int32"" Name=""connectivity"" format=""ascii"">\n");
+  if dim == 2
+    fprintf (fid, "%d %d %d \n", t);
+  else
+    fprintf (fid, "%d %d %d %d \n", t);
+  endif
+  fprintf (fid, "</DataArray>\n");
+  fprintf (fid, "<DataArray type=""Int32"" Name=""offsets"" format=""ascii"">\n");
+  fprintf (fid, "%d %d %d %d %d %d\n", (dim+1):(dim+1):((dim+1)*nelems));
+  fprintf (fid, "</DataArray>\n");
+  fprintf (fid, "<DataArray type=""Int32"" Name=""types"" format=""ascii"">\n");
+  fprintf (fid, "%d %d %d %d %d %d\n", eltype*ones(nelems,1));
+  fprintf (fid, "</DataArray>\n");
+  fprintf (fid, "</Cells>\n");
+
+endfunction
+
+## Print DataPoints
+function print_data_points(fid,nodedata,nnodes)
+  
+  ## # of data to print in 
+  ## <PointData> field
+  nvdata = size(nodedata,1);  
+  
+  if (nvdata)
+    fprintf (fid, "<PointData>\n");   
+    for ii = 1:nvdata    
+      data     = nodedata{ii,1};
+      dataname = nodedata{ii,2};
+      nsamples = rows(data);
+      ncomp    = columns(data);
+      if nsamples != nnodes
+	error("fpl_vtk_write_field: wrong number of samples in <PointData> ""%s""",dataname);
+      endif
+      fprintf (fid,"<DataArray type=""Float32"" Name=""%s"" ",dataname);
+      fprintf (fid,"NumberOfComponents=""%d"" format=""ascii"">\n",ncomp);
+      for jj = 1:nsamples
+	fprintf (fid,"%g ",data(jj,:));
+	fprintf (fid,"\n");
+      endfor
+      fprintf (fid,"</DataArray>\n"); 
+    endfor
+    fprintf (fid, "</PointData>\n");
+  endif
+
+endfunction
+
+function print_cell_data(fid,celldata,nelems)
+  
+  ## # of data to print in 
+  ## <CellData> field
+  nvdata = size(celldata,1); 
+
+  if (nvdata)
+    fprintf (fid, "<CellData>\n");
+    for ii = 1:nvdata
+      data     = celldata{ii,1};
+      dataname = celldata{ii,2};
+      nsamples = rows(data);
+      ncomp    = columns(data);
+      if nsamples != nelems
+	error("fpl_vtk_write_field: wrong number of samples in <CellData> ""%s""",dataname);
+      endif
+      fprintf (fid,"<DataArray type=""Float32"" Name=""%s"" ",dataname);
+      fprintf (fid,"NumberOfComponents=""%d"" format=""ascii"">\n",ncomp);
+      for jj = 1:nsamples
+	fprintf (fid,"%g ",data(jj,:));
+	fprintf (fid,"\n");
+      endfor
+      fprintf (fid,"</DataArray>\n");
+    endfor
+    fprintf (fid, "</CellData>\n"); 
+  endif
+
+endfunction
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