#19227: Graphs: DFS and broken distance-parameter
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Reporter: jmantysalo | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.9
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/graphs__dfs_and_broken_distance_parameter|
89b7490bec7e28f1c63bb81603eeab69fefb4e65
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Jori M\xe4ntysalo', 'oldvalue': ''}):
* status: needs_review => needs_work
* author: => Jori Mäntysalo
Old description:
> 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`.
New description:
This bug is visible at least on normal 64-bit Linux machine running self-
compiled Sage. This is architechture-dependent if you have for example
both integers and strings as vertices.
{{{
G = DiGraph({1:[2,10],2:[3],3:[4],4:[5],5:[6],10:[4]})
list(G.depth_first_search(1, distance=3))
}}}
This could 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`.
--
Comment:
I can make a better example later, when I am on faster computer.
But is plain path a good example? It won't show any difference between
`depth_first_search()` and `breadth_first_search()`.
Of course you can also do this; we can cross-review our codes.
--
Ticket URL: <http://trac.sagemath.org/ticket/19227#comment:10>
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