#19227: Graphs: DFS and broken distance-parameter
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Reporter: jmantysalo | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: graph theory | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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This bug is visible at least on normal 64-bit Linux machine running self-
compiled Sage. Might be architechture-dependent.
{{{
G = DiGraph({1:[2,10],2:[3],3:[4],4:[5],5:[6],10:[4]})
list(G.depth_first_search(1, distance=3))
}}}
This should output also `5` as it is three jumps from 1: `1->10->4->5`. It
is not outputted because `4` is already marked as seen vertex for
`1->2->3->4`.
I found this when doing #19197 and there is already some discussion about
it. I suspect that this might be used in other places too, and that must
be checked first.
Also note that #19223 might have collision as the fix may touch almost
same lines.
--
Ticket URL: <http://trac.sagemath.org/ticket/19227>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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