#19227: Graphs: DFS and broken distance-parameter
-------------------------------------+-------------------------------------
Reporter: jmantysalo | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/graphs__dfs_and_broken_distance_parameter|
89b7490bec7e28f1c63bb81603eeab69fefb4e65
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Changes (by jmantysalo):
* status: new => needs_review
* commit: => 89b7490bec7e28f1c63bb81603eeab69fefb4e65
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`.
>
> 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.
New 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`.
--
Comment:
I had to delete and modify some examples. Otherwise this just gives
deprecation warning.
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=89b7490bec7e28f1c63bb81603eeab69fefb4e65
89b7490]||{{{Deprecation of distance-parameter on
depth_first_search().}}}||
--
Ticket URL: <http://trac.sagemath.org/ticket/19227#comment:3>
Sage <http://www.sagemath.org>
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