#13461: Another WeylCharacterRing speedup
------------------------------------------+---------------------------------
Reporter: bump | Owner: bump
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.4
Component: combinatorics | Keywords:
Work issues: needs testing and tweaking | Report Upstream: N/A
Reviewers: | Authors: Daniel Bump
Merged in: | Dependencies:
Stopgaps: |
------------------------------------------+---------------------------------
After the patch, if a WeylCharacterRing is created with style="coroots",
characters are computed using not the Freudenthal multiplicity formula,
but
rather the Demazure character formula. This can be done using only integer
addition and subtraction. If we run {{{sage -t --long
weyl_characters.py}}},
it is more than twice as fast (26 seconds versus 69 seconds) as
previously.
If we omit {{{--long}}} it is slightly slower, so there is a speedup for
big computations and a slight penalty for small ones.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13461>
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 post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
