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CAChemE / pyomo-recipes

Useful conda recipes for Pyomo and dependencies.
MIT License
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Windows 10 & Pyomo 4.2.10784 & Gurobi 6.5.1: Solver returns 'None' values #15

Closed ckaldemeyer closed 8 years ago

ckaldemeyer commented 8 years ago

Hi everybody,

I had a weird error with your recipe on two Windows 10 X64 EDU installations:

Gurobi returns [None, None, ...] for the decision variables wheras other solvers e.g. "glpk" work fine. Gurobi itself is licensed and all Gurobi API examples are working. To the solver itself should be fine.

I reported and solved the problem here: https://groups.google.com/forum/#!topic/pyomo-forum/KrTMryO69f8

Short form: Installing the newest version (4.3.11388) via pip solved the problem for me.

Are you planning to provide the newest version in your recipe?

This would fix the error and using you recipe is more convenient than going the manual way.

Cheers Cord

astrojuanlu commented 8 years ago

Can you try the conda-forge channel? There is where new developments are going:

conda install -c conda-forge pyomo

https://anaconda.org/conda-forge/pyomo

ckaldemeyer commented 8 years ago

Works!

Are you also planning to provide a conda forge package for pyomo.extras?

astrojuanlu commented 8 years ago

Great! Closing then :smile:

astrojuanlu commented 8 years ago

It shouldn't be difficult to migrate pyomo.extras to conda-forge too, perhaps @whart222 has some plans on this.