Need help getting started with dynamically linked C++ files

[John Ambrosiano]

Hello,

I've tried the oregonator example with my installation of Octave and can't 
seem to get anywhere.

I've copied the example from the documentation and compiled with mkoctfile. 
The code is literally:
---------------------------------------
#include <octave/oct.h>

DEFUN_DLD (oregonator, args, ,
  "The `oregonator'.")
{
  ColumnVector dx (3);

  ColumnVector x = args(0).vector_value ();

  dx(0) = 77.27 * (x(1) - x(0)*x(1) + x(0)
                   - 8.375e-06*pow (x(0), 2));

  dx(1) = (x(2) - x(0)*x(1) - x(1)) / 77.27;

  dx(2) = 0.161*(x(0) - x(2));

  return octave_value (dx);
}

--------------------------------------

The first thing that happens is I get is this:

cc1plus: warning: changing search order for system directory "/usr/include"
cc1plus: warning:   as it has already been specified as a non-system directory
In file included from /users/rsqrd/local/include/g++-v3/backward/strstream:51,
                 from /usr/include/octave-2.1.34/octave/error.h:26,
                 from /usr/include/octave-2.1.34/octave/ov-base.h:38,
                 from /usr/include/octave-2.1.34/octave/ov-fcn.h:36,
                 from /usr/include/octave-2.1.34/octave/ov-builtin.h:32,
                 from /usr/include/octave-2.1.34/octave/defun-int.h:28,
                 from /usr/include/octave-2.1.34/octave/defun-dld.h:30,
                 from /usr/include/octave-2.1.34/octave/oct.h:33,
                 from oregonator.cc:1:
/users/rsqrd/local/include/g++-v3/backward/backward_warning.h:32:2: 
warning: #warning This file includes at least one deprecated or antiquated 
header. Please consider using one of the 32 headers found in section 
17.4.1.2 of the C++ standard. Examples include substituting the <X> header 
for the <X.h> header for C++ includes, or <sstream> instead of the 
deprecated header <strstream.h>. To disable this warning use -Wno-deprecated.
oregonator.cc: In function `octave_value_list Foregonator(const
   octave_value_list&, int)':
oregonator.cc:8: conversion from `Array<double>' to non-scalar type `
   ColumnVector' requested

-----------------------------------------------
If I comment out the offending lines (all except the declaration of dx and 
the return) just to get it to compile, I get a .oct file, but when I try to 
run in octave:
--------------------------------
octave> oregonator([1,2,3],0)
error: `oregonator' undefined near line 4 column 1
error: evaluating index expression near line 4, column 1
octave>
-------------------------
I checked that my version octave-2.1.34 supports dynamic linking and it does.

What could be wrong?




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