#16475: Bug in Gomory-Hu tree algorithm
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Reporter: foosterhof | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: graph theory | Resolution:
Keywords: gomory hu tree | Merged in:
gomory-hu gomory_hu_tree | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | e4604fa9ba9cf8ef5475620ed6b3d156402015d6
u/foosterhof/ticket/16475 | Stopgaps:
Dependencies: #12797 |
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Comment (by foosterhof):
Hi
I am trying to convert to use your suggestion, using frozenset, but the
call g1.vertices() (and thus also g2.vertices()) complains that it cannot
compare a (frozen)set to an int, as it will sort them. I have been trying
to give it a nice key lambda function to circumvent this problem, but no
luck so far. Any suggestions? Or does this mean that I can better just
leave it as using Set?
I have added a comment, including a reference to a piece of a book by A.
Schrijver, which explains the use of the partitions. (A Gomory-Hu tree can
be defined for a specific subset R of V, in which case these partitions
play a big role)
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New commits:
||[http://git.sagemath.org/sage.git/commit/?id=e4604fa9ba9cf8ef5475620ed6b3d156402015d6
e4604fa]||{{{Added comment on goal and use of Partition code}}}||
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Ticket URL: <http://trac.sagemath.org/ticket/16475#comment:8>
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