How does ode23 work in Matlab?

[Jordi Gutierrez Hermoso]

Is this also the place to talk about 'forge functions?

A friend of mine was trying to run some Matlab code that used ode23.
There is a small incompatibility with whatever Matlab does right now.
It seems that Matlab currently allows the function to be integrated to
have a few extra parameters that ode23 should pass to it. I don't have
a copy of Matlab available, so I don't know exactly what ode23 should
do. Help?

The fix should be easy: just make ode23 pass the right parameters and
have the same calling sequence as Matlab's ode23. Once I know what
should happen in Matlab's ode23, I'll send the patch myself. I'll also
clean up the docstring a little, which looks messy as compared to
other Octave docstrings.

Thanks,
- Jordi G. H.