Re: [OctDev] convhulln options.

[Pedro T. <pt...@te...>]

> This is the case in Octave with the "QJ" option:
>
>     octave:3> convhulln(cube,"QJ")
>     qhull warning: joggle ('QJ') always produces simplicial output.
>     Triangulated output ('Qt') does nothing.

But Qt works on command line qhull. Maybe there's some option about merging or 
unmerging facets that we are missing?

> > So long as the default all-simplicial case is returned as a matrix,
> > backward compatibility doesn't matter.  The user will need special code
> > to handle the non-simplicial facets anyway.
> >
> > Are these two cases different enough that we need different functions?
>
> I do not think so, since the output format will be dependent on the data
> and, in general, cannot be determined beforehand by the user.

Sure in the case of just simplicial or non simplicial. As far as I understand 
the need for two functions is to have one (convhulln) to keep matlab 
compatibility which should always return a matrix (maybe always simplicial 
facets too) and another one to allow for more specific output with user 
control on the options. The first funcion (convhulln) could just be a wrap 
around the second.

> I have already an idea on how to implement this change (i.e., returning a
> cell array instead of a matrix in the non-simplicial case.  Should I go
> ahead?

If it's possible to do so I would certainly appreciate it, and believe me, I'm 
just anxious about testing it ;).

Regards,
Pedro