Good day, I face a minimization problem for which I know a-priori that its optimum objective function value is 0 (zero) (As a matter of fact I have solved the problem via heuristics methods). Now, I want to solve the same problem via glpsol (command line). I have modeled the problem with Mathprog modeling language and I have provided a dat file. Please note that the program concerns a discrete space, therefore the variables have to take 0-1 values. When I run the glpsol from command line, I get a message saying that lp problem solved and there is a feasible solution. Then, it proceeds to the solution of IP. During the run, I get the following messages: "time used 1472 sec memory used 131Mb mip = not found yet >= 5.27 e-17 mip = not found yet >= 5.27 e-17 mip = not found yet >= 5.27 e-17 .... .... mip = not found yet >= 5.27 e-17
obj = 2e-1 infease = 4.387 e-15 obj = 2e-1 infease = 4.387 e-15 obj = 2e-1 infease = 4.387 e-15" then again: "mip = not found yet >= 5.27 e-17 mip = not found yet >= 5.27 e-17 mip = not found yet >= 5.27 e-17" At some point it was displayed: "warning : dual degeneracy : switching to primal simplex" Then it continues displaying similar messages like : "time used 2000 sec memory used 131Mb mip = not found yet >= 5.27 e-17 mip = not found yet >= 5.27 e-17 mip = not found yet >= 5.27 e-17 .... .... mip = not found yet >= 5.27 e-17" I must admit that I can not understand almost anything. Can anyone give me an explanation of what all these messages mean? Can anyone tell me in a few words what is happenning with my application? In addition, is there any source that I can get some information about the above terms, like " infease", " dual degeneracy", "primal simplex"? Thank you very much for your time and excuse my questions that may be too simple... -- Ioannis X. Tassopoulos
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