|Subject:||[Help-glpk] glpsol.exe differs from AMPL|
|Date:||Wed, 27 Jun 2012 17:10:47 -0400|
I am running glpk MIP and in AMPL and finding that the order of the solutions differ. For example, say I have a model where I need to maximize an objective based upon paired values X, Y, and Z (and each pairing has a score). I am not using any additional options for the solutions, eg specifying branch&cut, etc.
AMPL will tell me that the solution is X, Y, Z
glpk will tell me the solution is Z, X, Y.
I note that the sum of the scores for each solution is equivalent (as it should be as addition is commutative).
The problem I am trying to reconcile is is there a physical difference between ordering objects X, then Y, then Z with the order of Z, then X, then Y?
Not sure if this is clear to everyone, but the main point is I see differences.
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