#6962: Feedback vertex set, Feedback arc set
----------------------------+-----------------------------------------------
Reporter: ncohen | Owner: rlm
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.3.1
Component: graph theory | Keywords:
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
----------------------------+-----------------------------------------------
Changes (by ncohen):
* status: needs_work => needs_review
Old description:
> Adds the functions :
> * DiGraph.feedback_arc_set
> * DiGraph.feedback_vertex_set
>
> You will find a full description of the problem in the docstrings, or
> there :
> * http://en.wikipedia.org/wiki/Feedback_vertex_set
> * http://en.wikipedia.org/wiki/Feedback_arc_set
>
> The functions use Linear Programming, which needs one of the two optional
> packages GLPK
> {{{
> sage: install_package('cbc')
> }}}
> or CBC
> {{{
> sage: install_package('glpk')
> }}}
> installed. You will find a helpful documentation about the construction
> of the Linear Program in the docstring.
>
> One of the docstrings uses the function min_vertex_cover from #6680.
>
> Nathann
New description:
Adds the functions :
* DiGraph.feedback_arc_set
* DiGraph.feedback_vertex_set
You will find a full description of the problem in the docstrings, or
there :
* http://en.wikipedia.org/wiki/Feedback_vertex_set
* http://en.wikipedia.org/wiki/Feedback_arc_set
The functions use Linear Programming, which needs one of the two optional
packages GLPK
{{{
sage: install_package('cbc')
}}}
or CBC
{{{
sage: install_package('glpk')
}}}
installed. You will find a helpful documentation about the construction of
the Linear Program in the docstring.
One of the docstrings uses the function vertex_cover from #7600.
Nathann
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6962#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
