An alternative to using results.yml?

[Richard Dybowski]

If I run a Pyomo script using

pyomo --solver=glpk script.py

I get the right answer from the file results.yml

However, if I add the lines

opt = SolverFactory("glpk")
results = opt.solve(model)
print(results)

to the script and then try to run the script using

python script.py

the output is not the same (i.e. it claims that no solutions were found). How do I change the script so that the output is the same at that shown in the file results.yml? In particular, how can I extract the final values for the variables?

Richard

[Siirola, John D]

As of Pyomo 4.2, the results are automatically loaded back into the instance that you solved – so it is as simple as:

 

                model.myvar.display()

 

to show the value of any single variable,

 

                model.display()

 

to show all variables (and a lot of other information) about the model.

 

If you really need to recreate the old results object with the solution embedded within it, you can store the solution that is currently in the model into the results object with:

 

                model.solutions.store_to(results)

 

This change (and the reasons why) have been previously discussed in the forum, for example: https://groups.google.com/d/topic/pyomo-forum/wjjY2XvmG2w/discussion

 

john

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[rob nijland]

Thanks John for the reaction. 

It was a problem I had as well

Op maandag 22 februari 2016 16:50:53 UTC+1 schreef Richard Dybowski: