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FPL2dxoutputdata.m

## Copyright (C) 2004-2008  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
##  Dublin City University
##  School of Mathemetical Sciences
##  Ireland
##
##  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} {} FPL2dxoutputdata ( @var{filename}, @
##  @var{p}, @var{t}, @var{u},  @var{attr_name}, @var{attr_rank},  @
##  @var{attr_shape}, @var{endfile} )
##
##   Outputs data in DX form.
##
##   Variable must be a scalar, vector or tensor of doubles   
##
## @itemize @minus
##  @item @var{filename}= name of file to save (type string)
##  @item @var{p}, @var{t} = mesh
##  @item @var{u} = variable to save
##  @item @var{attr_name}  = name of the variable (type string)
##  @item @var{attr_rank}  = rank of variable data (0 for scalar, 1 for vector, etc.)
##  @item @var{attr_shape} = number of components of variable data  (assumed 1 for scalar)
##  @item @var{endfile} = 0 if you want to add other variables to the
##  same file, 1 otherwise
## @end itemize
## @end deftypefn

function FPL2dxoutputdata(filename,p,t,u,attr_name,attr_rank,attr_shape,endfile)

  p = p';
  t = t';
  t = t(:,1:3);

  fid=fopen (filename,'w');
  Nnodi = size(p,1);
  Ntriangoli = size(t,1);
  Ndati = size(u,1);

  fprintf(fid,'object "pos"\nclass array type float rank 1 shape 2 items %d data follows',Nnodi);

        for i=1:Nnodi
        fprintf(fid,'\n');
        fprintf(fid,'    %1.7e',p(i,:));
            endfor
              
              if (min(min(t))==1)
              t=t-1;
            elseif(min(min(t))~=0)
              disp('WARNING: check triangle structure')
            endif                    
                        # In DX format nodes are 
                        # numbered starting from zero,
                        # instead we want to number
                        # them starting from 1!
                        # Here we restore the DX
                        # format

              fprintf(fid,'\n\nobject "con"\nclass array type int rank 1 shape 3 items %d data follows',Ntriangoli);
                    for i=1:Ntriangoli
                    fprintf(fid,'\n');
                    fprintf(fid,'      %d',t(i,:));
                        endfor
                          
                          fprintf(fid,'\nattribute "element type" string "triangles"\nattribute "ref" string "positions"\n\n');
                          
                          if ((attr_rank==0) & (min(size(u))==1))
                          fprintf(fid,'object "%s.data"\nclass array type double rank 0 items %d data follows',attr_name,Ndati);
                                fprintf(fid,'\n %1.7e',u);

                                    else
                                      fprintf(fid,'object "%s.data"\nclass array type double rank %d shape %d items %d data follows', ...
                                            attr_name,attr_rank,attr_shape,Ndati);
                                      for i=1:Ndati
                                      fprintf(fid,'\n');
                                      fprintf(fid,'    %1.7e',u(i,:));
                                          endfor

                                          endif

                                            if Ndati==Nnodi
                                            fprintf(fid,['\nattribute "dep" string "positions"\n\n' ...
                                                       'object "%s" class field\n'...
                                                       'component "positions" value "pos"\n'...
                                                       'component "connections" value "con"\n'...
                                                       'component "data" value "%s.data"\n'],...
                                                  attr_name,attr_name);
                                          elseif Ndati==Ntriangoli
                                            fprintf(fid,['\nattribute "dep" string "connections"\n\n' ...
                                                       'object "%s" class field\n'...
                                                       'component "positions" value "pos"\n'...
                                                       'component "connections" value "con"\n'...
                                                       'component "data" value "%s.data"\n'],...
                                                  attr_name,attr_name);
                                          endif

                                            if(endfile)
                                            fprintf(fid,'\nend\n');
                                          endif
                                            
                                            fclose (fid);


endfunction

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