#13698: Access to graph routines of the GLPK
------------------------------------------------------------------------+---
Reporter: christiankuper |
Owner: jason, jkantor
Type: enhancement |
Status: needs_review
Priority: major |
Milestone: sage-5.8
Component: numerical |
Resolution:
Keywords: out-of-kilter, minflow, maxflow, critical path, GLPK |
Work issues:
Report Upstream: N/A |
Reviewers: Nathann Cohen
Authors: Christian Kuper |
Merged in:
Dependencies: |
Stopgaps:
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Changes (by ncohen):
* status: needs_info => needs_review
* reviewer: => Nathann Cohen
Old description:
> Certain types of linear problems can be more efficiently solved with
> algorithms more specialized than the simplex algorithm. An example of
> such problems is a mincost problem. The GLPK provides a set of graph /
> network algorithms which currently have got not interface to Sage.
>
> This patch implements a new backend intended to provide access to the
> GLPK graph / network routines. The initial implementation should provide
> an interface to
>
> * glp_mincost_okalg - Solving mincost problems with the out-of-kilter
> algorithm
> * glp_maxflow_ffalg - Solving maxflow problems with the Ford-Fulkerson
> algorithm
> * glp_cpp - Solving critical path problems
>
> In addition it provides support for reading and writing problem data to
> files
>
> Apply :
> * [attachment:trac_13698_glpk_graph_routv2.patch]
> * [attachment:trac_13698-rev.patch]
> * [attachment:trac_13698-rev2.patch]
New description:
Certain types of linear problems can be more efficiently solved with
algorithms more specialized than the simplex algorithm. An example of such
problems is a mincost problem. The GLPK provides a set of graph / network
algorithms which currently have got not interface to Sage.
This patch implements a new backend intended to provide access to the GLPK
graph / network routines. The initial implementation should provide an
interface to
* glp_mincost_okalg - Solving mincost problems with the out-of-kilter
algorithm
* glp_maxflow_ffalg - Solving maxflow problems with the Ford-Fulkerson
algorithm
* glp_cpp - Solving critical path problems
In addition it provides support for reading and writing problem data to
files
Apply :
* [attachment:trac_13698_glpk_graph_routv2.patch]
* [attachment:trac_13698-rev.patch]
* [attachment:trac_13698-rev2.patch]
* [attachment:trac_13698-rev3.patch]
--
Comment:
Helloooooooooo again ! I just went over the patch again and changed a few
characters. I added several 's' to verbs so that they would either all
have one, nd I removed a variable named "graph_sol" which was not really
useful as a class parameter.
If you as ok with this then we can set this ticket to positive review !
`;-)`
Have fuuuuuuuuuuuuuuuuuuuuuun !!
Nathann
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13698#comment:34>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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