Vertex Coloring, Edge Coloring

[nathanncohen]

Hello everybody !!!

Here are two new functions for the Graph class in Sage : vertex_coloring and edge_coloring.

If you have no LP Solver installed, you can download GLPK or CBC from this address : http://www.sagemath.org/packages/optional/

These functions should be ---way--- more efficient than the previous ones, regardless of the Linear Solver you chose to use.

DEPENDS ON #7270 !!!!!!!!!!!!!

Component: graph theory

Author: Nathann Cohen

Reviewer: Karl-Dieter Crisman, Minh Van Nguyen

Merged: sage-4.3.alpha1

Issue created by migration from https://trac.sagemath.org/ticket/6679

[nathanncohen]

First patch !

[nathanncohen]

Attachment: coloring-1.patch.gz

Attachment: coloring-1.2.patch.gz

First patch !

[nathanncohen]

comment:1

Hmmm... The two patches coloring-1 and coloring-1.2 are exactly identical, but I do not know how to remove the second one ^^;

[nathanncohen]

Description changed:

--- 
+++ 
@@ -11,5 +11,3 @@
 sage -f http://www-sop.inria.fr/members/Nathann.Cohen/cbc-2.3.spkg
 
 I hope I learned what I had to with my previous patch, as I hope you will find those functions sufficiently and correctly documented. These functions should be ---way--- more efficient than the previous ones, regardless of the Linear Solver you chose to use.
-
-( I have to add that I will be absent next week, but even though I will be able to answer any of your questions and to post fixes until tomorrow evening. I chosed to post these two functions now hoping they could be integrated with the patch for LP into the next release of Sage )

[nathanncohen]

Description changed:

--- 
+++ 
@@ -2,7 +2,7 @@
 
 Here are two new functions for the Graph class in Sage : vertex_coloring and edge_coloring.
 
-Those new functions both use Linear programming, so to use them you will have to install the patches MIP-1 to MIP-5 in #6502 along with the package GLPK :
+Those new functions both use Linear programming, so to use them you will have to install the patche AllMIP-2.flattened in #6502 along with the package GLPK :
 
 https://github.com/sagemath/sage-prod/issues/6502
 

[nathanncohen]

Description changed:

--- 
+++ 
@@ -4,7 +4,7 @@
 
 Those new functions both use Linear programming, so to use them you will have to install the patche AllMIP-2.flattened in #6502 along with the package GLPK :
 
-https://github.com/sagemath/sage-prod/issues/6502
+http://www.sagemath.org/packages/optional/
 
 If you want them to be ever more efficient, you can also install COIN-OR/CBC ( from #6603 ) with this line :
 

[nathanncohen]

Description changed:

--- 
+++ 
@@ -2,7 +2,7 @@
 
 Here are two new functions for the Graph class in Sage : vertex_coloring and edge_coloring.
 
-Those new functions both use Linear programming, so to use them you will have to install the patche AllMIP-2.flattened in #6502 along with the package GLPK :
+Those new functions both use Linear programming, so to use them you will have to install the patch AllMIP-2.flattened in #6502 along with the package GLPK :
 
 http://www.sagemath.org/packages/optional/
 

[nathanncohen]

comment:7

As the functions dealing with LP have not been reviewed, I prefer to rewrite the MIP class for Sage to make it easier to use. I will post a new version of the MIP patch as soon as possible, along with all the patches for functions using it.

Sorry for the trouble, I'll try to make it quick !

Nathann