Dear Nathann, dear David Joyner,
On Sun, Apr 18, 2010 at 04:54:07PM +0200, Nathann Cohen wrote:
> The thing is that IncidenceStructure really needs some attention...
>
> It is not even iterable (so I could not even write "for a,b,c in
> steiner_triple_system(7)"), and its methods are just awful. It has
> both a .blcks (list) and a .blocks (method returning the previous
> list), pnts and points, a .v parameter, and does not seem to have any
> specific method... It seems to be an odd wrapper for a BipartiteGraph.
> This being said, it exactly encodes the information of a Hypergraph,
> which is totally absent of Sage.
>
> BlockDesign immediately returns an instance of IncidenceStructure....
>
> Could it be that all these classes are in Sage because of counterparts
> in another software ?
Could very well be. David?
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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