#18045: Wrong result returned by is_planar on a given embedding
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Reporter: ncohen | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.6
Component: graph theory | Keywords:
Merged in: | Authors: Nathann Cohen
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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As reported on AskSage [1], the function `.is_planar` can return wrong
results when given a specific embedding to run its computations on.
This actually comes from a mistake in a `if/else` and variable types, as
`bool(a_dictionary)` returns `True` when the dictionary is nonempty. The
original authors did not seem to be aware of that, and once fixed the code
does not mak the mistake again.
Nathann
[1] http://ask.sagemath.org/question/26301/testing-planarity-on-embedding-
gives-wrong-result/
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Ticket URL: <http://trac.sagemath.org/ticket/18045>
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