On Sat, Jun 28, 2008 at 12:48 PM, Robert Bradshaw <[EMAIL PROTECTED]> wrote: > > On Jun 28, 2008, at 9:33 AM, David Joyner wrote: > >> On Sat, Jun 28, 2008 at 11:00 AM, John Cremona >> <[EMAIL PROTECTED]> wrote: >>> >>> It seems that what Dan Bump's instructions did not specify is what >>> properties the class assigned to ._combinatorial_class must have. >>> And it needs something which PermutationGroupElement does not have. >>> >>> Does that help? >> >> Okay. Maybe the best thing is to write a wrapper to GAP's GroupRing >> function. > > I disagree, using CombinatorialAlgebra will be a much better option. > >>>> Can anyone explain "AttributeError: type object >>>> 'sage.groups.perm_gps.permgroup_element.Permutation' has no >>>> attribute >>>> 'count'" >>>> (in words of two syllables or less, if possible:-)? > > Sure. It means that it's trying to use a method called "count" but > the class "Permutation" found in sage/groups/perm_gps/ > permgroup_element doesn't define one. What you need to do is make a > method called count. > > Actually, looking at the code (and someone more familiar with sage- > combinat should correct me) it looks like _combinatorial_class should > be the Parent (i.e. the group) rather than the element. It would > probably make sense to do something like > >> class PermutationGroupRing(CombinatorialAlgebra): >> def __init__(self, R, G): >> self.group = G >> self._combinatorial_class = G # NOTE the change >> self._one = G.identity() >> self._name = 'Group ring of %s'%str(G) >> self._prefix = '' >> CombinatorialAlgebra.__init__(self, R) >> def _multiply_basis(self, a, b): >> c = a*b >> return c > > and add a count method to the group class.
That worked! Thank you! > > - Robert > > > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
