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