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APMonitor / apm_julia

APMonitor Optimization Suite in Julia
http://apmonitor.com
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Writing .apm file from Julia #1

Open samiit opened 8 years ago

samiit commented 8 years ago

Thank you for the extensive work. I wanted to know if we can write the .apm model file from after creating the problem in Julia?

Sam

APMonitor commented 8 years ago

Sam,

Here is an example in Python where a model file (apm) is written based on an input data file:

http://apmonitor.com/do/index.php/Main/ModelIdentification

Let me know if this is what you are looking for or if you had something else in mind.

Best regards,

John Hedengren On Jul 7, 2016 12:23 AM, "Sam Mathew" notifications@github.com wrote:

Thank you for the extensive work. I wanted to know if we can write the .apm model file from after creating the problem in Julia?

Sam

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samiit commented 8 years ago

Thanks for that answer John.

I meant, something like, writeApm() type of function - does it exist?

Finally, I managed to create a .apm file using Julia just for text generation. I uploaded the .apm file and got the results from your APMonitor website using the command apm_load(s,a,"model.apm").

It was a simple linear problem, but APM gave me a sub-optimal solution. I got a lower minimum using CBC. I was just exploring APMonitor though, so it can be that I missed some setting. In case you are interested, here is the file:

model.apm.txt

APMonitor commented 8 years ago

Sam,

You can either write and load a text file or send each line of the APM file to the server with the apm() function. If you'd like to create a writeApm() function, we can add it to the code base with proper attribution.

Could you add the following to your apm file for the convergence? :

File apopt.opt minlp_gap_tol 0 minlp_maximum_iterations 100000 End File

Perhaps the solver is terminating early due to iterations or gap tolerance. This will create a new apopt.opt options file. Some of the default options are listed here:

http://apopt.com/download.php

Best regards,

John Hedengren On Jul 11, 2016 12:11 AM, "Sam Mathew" notifications@github.com wrote:

Thanks for that answer John.

I meant, something like, writeApm() type of function - does it exist?

Finally, I managed to create a .apm file using Julia just for text generation. I uploaded the .apm file and got the results from your APMonitor website using the command apm_load(s,a,"model.apm").

It was a simple linear problem, but APM gave me a sub-optimal solution. I got a lower minimum using CBC. I was just exploring APMonitor though, so it can be that I missed some setting. In case you are interested, here is the file:

model.apm.txt https://github.com/APMonitor/apm_julia/files/356417/model.apm.txt

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