.row, .col files

[jose santiago rodriguez]

Hi,

I am wondering how can i get .row and .col files in promo to determine the order of variables in the generated nl file.

Thanks,

Santiago

[Carl Laird]

I believe the option is symbolic_solver_labels.

Regards,

Carl D. Laird
Associate Professor, School of Chemical Engineering, Purdue University
Ph: 765.494.0085

Email: carl...@purdue.edu

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[simon...@gmail.com]

I wanted to solve a nl-problem using pyome + couenne solver once and identiffied the following steps:

1) Create model with pyomo 

2) run in commandline: 

- pyomo model.py --save-model model.nl --symbolic-solver-labels

   creates: 

- model.nl (file) 

- Row-file (variable names)

- Column-fule (constraint names) 

3) Run e.g. couenne on nl-file 

        - couenne -s model.nl 

   gives solution file: 

- model.sol

4) Combine informations in model.sol and Row-file for postprocessing

Python Script

At the end i came up with a linear model, thats why step 4) never happend. Depending on the solver the ouput format might look different i guess. 

[Siirola, John D]

For the record (/archives), you can always run couenne directly (combining your steps 2 & 3):

 

                pyomo model.py --solver=couenne  --symbolic-solver-labels  --keepfiles

 

The keepfiles option will keep pyomo from deleting the .nl, .row, .col, .sol, and .log [solver output] files.  The names are automatically (and randomly) generated in the system temp directory, so they can be a bit tricky to hunt down.  The solution is to create an empty directory where you want pyomo to store all its temporary files:

 

                mkdir foo

                pyomo model.py  --solver=couenne --symbolic-solver-labels  --keepfiles --tempdir foo

 

That way, the directory should end up with exactly 5 files and you can easily sort things out by the file extension.

 

john

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[jose santiago rodriguez]

Thanks for all the comments,

John I am running everything from a python script and i would like to use that temporary directory option. How can I do that from python without using the pyomo command. Moreover, how do i list all pyomo options? 

Thanks again,

Santiago

[Siirola, John D]

I think this should work:

   from pyutilib.services import TempfileManager

   TempfileManager.tempdir = "/path/to/my/dir"

To get options for the Pyomo command (or runph or runef) you can add the "--help" option. The catch is that the available options depend on the command (e.g. "solve" or "convert") and the solver you choose. So, to get then options available when solving. A model with gurobi you would run:

   pyomo solve --solver gurobi --help

John