#12912: Interface to Fokko Ducloux's Coxeter 3
-----------------------------------+----------------------------------------
Reporter: nthiery | Owner: sage-combinat
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.7
Component: combinatorics | Resolution:
Keywords: coxeter, days45 | Work issues: coxeter_group.py in
sage/libs ?
Report Upstream: N/A | Reviewers: Anne Schilling, Nicolas M.
Thiery
Authors: Mike Hansen | Merged in:
Dependencies: #8359 | Stopgaps:
-----------------------------------+----------------------------------------
Comment (by aschilling):
The index set was computed incorrectly (for affine types). I fixed that.
Unfortunately, going from sage-5.6 to sage-5.7.beta4 the following now
fails:
{{{
sage: C = CoxeterGroup(['A',3,1],implementation='coxeter3')
sage: s = C.gens()
sage: s[0]*s[1]
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
<ipython-input-3-059a6d605fdd> in <module>()
----> 1 s[Integer(0)]*s[Integer(1)]
/Applications/sage-5.7.beta4/local/lib/python2.7/site-
packages/sage/categories/magmas.pyc in __mul__(self, right)
307 """
308 if have_same_parent(self, right) and hasattr(self,
"_mul_"):
--> 309 return self._mul_(right)
310 from sage.structure.element import get_coercion_model
311 import operator
/Applications/sage-5.7.beta4/local/lib/python2.7/site-
packages/sage/libs/coxeter/coxeter_group.pyc in _mul_(self, y)
450 """
451 result = self.value * y.value
--> 452 return self.parent()(result)
453
454 def __eq__(self, y):
/Applications/sage-5.7.beta4/local/lib/python2.7/site-
packages/sage/structure/parent.so in sage.structure.parent.Parent.__call__
(sage/structure/parent.c:7474)()
TypeError: No conversion defined from Coxeter group of type a and rank 4
to Coxeter group of type ['A', 3, 1] implemented by Coxeter3
}}}
Anne
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12912#comment:49>
Sage <http://www.sagemath.org>
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