Originally posted by: SystemAdmin

[namsu said:]

Dear

Hello, i'm implemented a column generation using concert, cplex 11.0 in windows XP 32bit.
At first, I generate the initial columns using a heuristic.

Strange thing is, sometimes, heuristic alg. generate the optimal solution.
(<- after i compare the objective value from heuristic and the objective from col. generation.)<br />But, my col. generation adds some columns, after then, it says, achieved opt. solution.

Could you tell me how this can happen?
thanks in advance
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