Hi Mark! On Thu, Feb 02, 2012 at 05:07:35AM -0500, msh...@math.vt.edu wrote: > When do I add code to the file coxeter_group.py in categories as > opposed to combinat?
The question is whether the implementation of the method depends on the specific data structure, or not (that is it is generic). > For example, why does the Coxeter group element method > apply_simple_reflection NOT appear in the category code? That's a perfect example: for Weyl groups, it is implemented by looking at the action on roots. For a Coxeter group implemented in term of reduced word, like in Coxeter 3, that would be something else. There is no generic implementation. In usual computer parlance, coxeter_group.py provides an abstract class for elements of the coxeter group. Whereas WeylGroupElement is a concrete class: http://en.wikipedia.org/wiki/Class_%28computer_programming%29#Abstract Cheers, Nicolas -- Nicolas M. Thiéry "Isil" <nthi...@users.sf.net> http://Nicolas.Thiery.name/ -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
