#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 ncohen):

 > By the way, glancing through your code, you should probably use
 `hamming_weight`

 Right, it is faster indeed. It now takes ~12s. `hamming_weight` does the
 job at a much lower level.

 > and not `sum` to determine the hamming weight. Sum could (should?)
 behave as over `GF(2)` in something like this code.

 I apply it to ints, not to `GF(2)` elements.

 Thanks,

 Nathann

--
Ticket URL: <http://trac.sagemath.org/ticket/19180#comment:5>
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