Is there a bug with using chromatic_number together with Gurobi? [closed]

asked 2015-01-19 15:19:01 -0500

updated 2015-01-19 15:19:17 -0500

I have installed the LP solver Gurobi, and it seems to work successfully work with the vertex_coloring() command. But I wanted to compare runtimes with chromatic_number, and Sage seems to hang whenever I try this.

I construct a graph G, and then when I run the command G.chromatic_number(algorithm="MILP"), Sage hangs. I can tell something has gone wrong because it doesn't come back even when I give it a very small simple graph G, and because Linux tells me that I know have a zombie process.

Any suggestions would be much appreciated.

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Closed for the following reason question is not relevant or outdated by MattKahle
close date 2015-01-20 07:51:01.343609

Comments

to reproduce this, it would be good to know precisely on what G it hangs, and also your Gurobi and Sage versions...

Dima gravatar imageDima ( 2015-01-19 15:42:49 -0500 )edit