On Jul 18, 2008, at 1:53 PM, Arnaud Bergeron wrote: > In the _mul_ method I allow concatenation of words of differing > alphabet as long as all the letters of both words are in one of the > alphabets. I would like to keep this behavior but the coercion > mechanism refuses. I know I have to tell it either how to do it or > just that it's possible but how?
Yes. Write a coerce_map_from_impl(self, S) method on your class that returns True iff the alphabet of S is a subset of the alphabet of self. Then write your __call__ method to do the element creation properly. > Maybe I should just wait for Sage 3.1 and the new model and implement > that. Especially if the documentation is much better, I could figure > it out. Yes, things should be much cleaner, and I'm also focusing on better documentation (gives me something to do every time I touch parent.pxd :). Specifically, regarding the instructions above, coerce_map_from_impl will become _has_coerce_map_from_ and you will edit the _element_constructor_ method rather than __call__. - Robert --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
