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What are the allowed extensions for the parameter filename in pyscipopt.Model.writeProblem(filename)?

It works if filename='a'or filename='a.mps', but if e.g. filename='a.problem', then it fails with the error code:

Exception: SCIP: a required plugin was not found !
Daniel Paleka
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1 Answers1

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The file extension is used to indicate the file format to write out the problem. The standard formats are CIP, MPS, and LP. The full list can be found here and more formats can be supported by adding custom file readers.

There is no PROBLEM file format and that is why you got this error. You might have added a custom file reader to support PROBLEM files and that is why SCIP's error message is a bit cryptic here.

mattmilten
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  • No, I haven't added anything. I just thought any filename is admissible, since I only want to read from PySCIPOpt, and the [documentation](https://scipopt.github.io/PySCIPOpt/docs/html/classpyscipopt_1_1scip_1_1Model.html#aaeea39150fbf007180b7ab7d8e476d2e) says only "the name of the file to be used". Can I submit a PR to the documentation? – Daniel Paleka Jun 11 '21 at 14:07
  • Of course! PRs are always very welcome - even if it's "just" about documentation – mattmilten Jun 12 '21 at 12:42