#13461: Another WeylCharacterRing speedup
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Reporter: bump
| Owner: bump
Type: enhancement
| Status: needs_work
Priority: major
| Milestone: sage-5.4
Component: combinatorics
| Resolution:
Keywords: Weyl character ring, Demazure characters, Demazure-Lusztig
operators | Work issues:
Report Upstream: N/A
| Reviewers: Anne Schilling
Authors: Daniel Bump
| Merged in:
Dependencies:
| Stopgaps:
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Comment (by bump):
Thanks ... I thought I tried that.
> Do you want to keep the "debug" options in _demazure_helper? If so,
please give a short description of
> what it is for and a doc test with it.
My experience (with GNU Go) is that it is a good idea to leave debug code
in for something this complicated. There is also debug code in the
Freudenthal method. However this code is not meant
to be used in normal operation. A doctest would look something like this:
{{{
sage: A2=WeylCharacterRing("A2",style="coroots")
sage: A2.demazure_character((1,1),word=[1,2],debug=True)
cm[1]=(2, -1)
cm[2]=(-1, 2)
i=2
v=(1, 1), coroot=1
mu=(1, 1), next[mu]=1
mu=(2, -1), next[mu]=1
i=1
v=(2, -1), coroot=2
mu=(2, -1), next[mu]=1
mu=(0, 0), next[mu]=1
mu=(-2, 1), next[mu]=1
v=(1, 1), coroot=1
mu=(1, 1), next[mu]=1
mu=(-1, 2), next[mu]=1
a2(0,0) + a2(-2,1) + a2(2,-1) + a2(1,1) + a2(-1,2)
}}}
This can be really helpful for figuring out what the code is doing but I'm
dubious that a doctest is appropriate. Should I take the code out?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13461#comment:10>
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