id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,revision
509,Unstable NetworkSimplex Algorithm,Chassein,Alpar Juttner,"Hey everyone,
i was using the NetworkSimplex algorithm from Lemon to solve min cost flow Problems.
I encountered the following problem. I have two different objective functions (c_1 and c_2) for the same minimum cost flow Problem (same graph, same supply, same bounds).
Let x_i be the solution that I obtain by calling the NetworkSimplex with the objective function c_i. (i=1,2)
My problem is that x_2 performs about 2% better under objective function c_1 as x_1 does!
(c_1(x_2) < c_1(x_1)). Note that c_1 and c_2 are very similar and defined by double values.
I cannot solve the problem by making c_1 and c_2 integral after scaling them.
Is this 2% inaccuracy just a normal unavoidable effect or is there something I can do to get more accuracy? I'm using Version 1.3.1.
Best Regards
Andre Chassein",defect,closed,major,LEMON 1.4 release,core,release branch 1.3,invalid,,,