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I build up a optimization model in ojalgo (ExpressionsBasedModel). Is there a way to export it to check the model? So far I am only able to export the lower and upper limits of variables and constraints but I am not able to export the variable's coefficients of constraints. I checked the available functions but I coudn't find an appropriate one. Only importing an MPS file I could find. Has someone a hint how to export the model without using an extra framework/external libraries?

Thomas
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There is no way to generate/export an MPS file using ojAlgo.

If you want to verify solver results with some 3:d party solver, you can do that. I believe the community (free) version of cplex allows up to 1000 variables and constraints.

https://github.com/optimatika/ojAlgo-extensions/tree/master/ojAlgo-cplex

apete
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  • Thank you for the information. It's a pity that there is no native export capability. Your suggestion is what I am doing more or less now using an external solver to export the model data. However, I have had to change the package source code and I thought I could avoid it. – Thomas Sep 27 '17 at 11:22
  • By the way, the cplex extension has an error in file SolverCPLEX.java in line 254. Limited fixed variables are not contained in the myIloCplex object. This has to be checked here. – Thomas Sep 27 '17 at 20:32
  • If you think you found a bug (or made some improvements) then open an issue or pull request at GitHub. https://github.com/optimatika/ojAlgo-extensions/issues – apete Sep 30 '17 at 08:49
  • I opened an issue as I have almost no understanding of the whole library. – Thomas Oct 06 '17 at 12:34