#19180: A (220,84,38,28)-strongly regular graph
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Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.9
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers:
theory | Work issues:
Keywords: | Commit:
Authors: | 7cbfa8b1425fccb6ca404a6f72f253b5ccf99eeb
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
public/19180 |
Dependencies: |
#19133 |
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Comment (by jsrn):
You mentioned (on https://groups.google.com/forum/#!topic/sage-
support/dPG73HQZK-Y) that the function takes 40s. I don't have time right
now to check out the ticket and compile and test, but I get
{{{
sage: %timeit L = [ w for w in
codes.ExtendedQuadraticResidueCode(47,GF(2)) if w.hamming_weight() == 12 ]
1 loops, best of 3: 16.4 s per loop
}}}
By the way, glancing through your code, you should probably use
`hamming_weight` and not `sum` to determine the hamming weight. Sum could
(should?) behave as over `GF(2)` in something like this code.
--
Ticket URL: <http://trac.sagemath.org/ticket/19180#comment:3>
Sage <http://www.sagemath.org>
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