Pyomo example

[Stu Geza]

Hi All,

I am a new user and not an experienced python user, I want to use pyomo for optimization.

I tool a transportation example from pyomo website and created a python file. I tried to run it but the results were not displayed. I was not able to see any result from my run.

I have attached the python file I created and  a pdf of what I got. I think I am missing something. Can any one help me on this?

Thank you

[David Woodruff]

you had indentation errors and one place where you used "instance" even though that is not defined, so I replaced it with "model" because that is the instance in a concrete model.

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[Stu Geza]

 

 

Thank you for your help. Now, I can see the error messages. The error says could not locate 'solver'. I have attached the error message for more information

I thought solvers are installed when installing Pyomo. I got pyomo from pyomo.org. Do I need to get solvers separately. If so, where is the best place to find the solvers? Are any of the solvers free?

Thanks again for you help, I am just eager to get it going.

[Siirola, John D]

Pyomo does not include any solvers.  You must install them yourself.

 

Please see the Pyomo Installation Guide -- specifically section 10 -- for information on installing solvers:  https://software.sandia.gov/downloads/pub/pyomo/PyomoInstallGuide.html#Solvers

 

john