Using structures in OCT files

[Andreas Stahel]

Dear Octave users

currently I am attempting to update a FEM package an with Octave 3.4
I have a hard time to implement a feature in an OCT file
On the Octave level I will have a structure Mesh of the type

Mesh.nodes = [0.0 0.5; 0.2,0.2;0.1,2.0]
Mesh. edge = [1 2; 2 3; 3 1]

Then in an C++ file I need to access those structures
in a command FEMEquation(Mesh, ...)

With older version of Octave I used codes like below

===================
DEFUN_DLD (FEMEquation, args, , "[...] = FEMEquation (...)\n ")
{
  octave_value_list retval;
  using namespace std;
  octave_value_list argin;
  octave_value_list res;
  int nargout;

  Octave_map arg0 = args(0).map_value ();

  Octave_map::const_iterator p1 = arg0.seek ("nodes");
  const Matrix nodes  =  arg0.contents(p1)(0).matrix_value();
  p1 = arg0.seek ("edge");
  const ColumnVector edge  =  arg0.contents(p1)(0).column_vector_value();
......
====================

Then I could use those matrices. Even with the help of section A.1.5 
Structures in Oct-Files
in the manual I could not figure out how to adapt to the new method.
This failure is caused by my lack of knowledge of C++ and Octave 
programming.
I would really appreciate some help or a good pointer to a similar example.


--
Andreas Stahel       E-Mail: address@hidden
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