Changes between Version 1 and Version 18 of Ticket #13391


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Timestamp:
08/24/12 23:38:53 (10 years ago)
Author:
bump
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  • Ticket #13391

    • Property Status changed from new to needs_review
    • Property Reviewers changed from to Anne Schilling
    • Property Owner changed from sage-combinat to bump
    • Property Milestone changed from sage-5.3 to sage-5.4

  • Ticket #13391 – Description

    v1 v18  
    1 The multiplication algorithm for {{{WeylCharacterRings}}} is changed by this patch to an algorithm based on the Brauer-Klimyk formula. This algorithm is asymmetric, so that a*b and b*a are equal but computed differently. It gives a modest speedup for sage -t weyl_characters.py but for tasks it is a dramatic improvement. As an example, create the spin character of Spin(9):
     1The multiplication algorithm for {{{WeylCharacterRings}}} is changed by this patch to an algorithm based on the Brauer-Klimyk formula. This algorithm is asymmetric, so that a*b and b*a are equal but computed differently. They are sometimes interchanged in an attempt to give the most efficient evaluation. This patch gives a modest speedup for {{{sage -t --long weyl_characters.py}}} but in certain cases it is a dramatic improvement. As an example, create the spin character of Spin(9):
    22
    33{{{