#17798: Create a class for Coxeter matrices and types
-------------------------------------+-------------------------------------
Reporter: tscrim | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.10
Component: group theory | Resolution:
Keywords: Coxeter groups, | Merged in:
matrices, types, days64 | Reviewers: Jean-Philippe Labbé,
Authors: Travis Scrimshaw, | Travis Scrimshaw
Jean-Philippe Labbé | Work issues:
Report Upstream: N/A | Commit:
Branch: | e659186e20bbb4b4a942008dff32901659e42503
public/combinat/coxeter_matrices-17798| Stopgaps:
Dependencies: #17990, #18152, |
#18743 |
-------------------------------------+-------------------------------------
Comment (by tscrim):
Replying to [comment:79 nthiery]:
> Until we have a class for matrices with arbitrary indexing, I believe
> we should stick to what has been done so far: index the matrix by
> `0,...,|I|-1` with row/column i corresponding to the i-th element of
> the indexing set `I` (following Python's convention: i=0 gives the
> first element).
So my takeaway from what you're saying is that you also agree that the
default indexing set for Cartan matrices should be `0, 1, ..., |I|-1`. Is
that correct? We aren't changing the actual `__getitem__` in this ticket
(which always uses `0, 1, ...., |I|-1`). The failures in cluster seed was
caused by the root system having the "wrong" indexing set.
--
Ticket URL: <http://trac.sagemath.org/ticket/17798#comment:80>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
