#18516: Posets: canonical_label() returns a poset from lattice
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Reporter: jmantysalo | Owner:
Type: defect | Status: needs_info
Priority: major | Milestone: sage-6.8
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/posets__canonical_label___returns_a_poset_from_lattice|
c742ca4204a252d2ebebe4a2dd6d037469f019c4
Dependencies: | Stopgaps:
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Comment (by ncohen):
> I don't understand. How? Calling `canonical_label` from DiGraph gives a
DiGraph, not a dictionary that could be directly used for `relabel()`.
{{{
sage: graphs.PetersenGraph().canonical_label(certify=True)
(Graph on 10 vertices,
{0: 9, 1: 8, 2: 5, 3: 4, 4: 6, 5: 7, 6: 2, 7: 3, 8: 1, 9: 0})
}}}
Honestly I don't see why `canonical_label` should always return a copy of
the graph. In this present case, we see that it is not necessary at all
`O_o`
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/18516#comment:6>
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