Getting "info" after optimization using IPOPT

[Huckleberry Febbo]

Hello,

I am a new user running IPOPT using JuMP and julia and I am having some difficulty getting some of the output information from IPOPT, for instance, I want the CPU time and the number of iterations. I see this data when I run IPOPT pop up on the screen, but I would like to store it in a variable. I tried to use some of the options here:

http://www.coin-or.org/Ipopt/documentation/node41.html#SECTION0001110100000000000000

for instance, I tried: 

mdl     = Model(solver = IpoptSolver(print_level=3,print_info_string,"yes",....

but I get

I tried several of these options with similar results. Any thoughts on how I can do this?

Another issue is that maybe this information is already in a variable and I do not know about it. This is because I do not know how to see what is in the "workspace" ( I am a MATLAB user ). Is there a way to see what variables are in the workspace in julia?

Thanks,

Huck

[Tony Kelman]

Hi Huck,

The first one has what should be an easy answer, just change `print_info_string,"yes"` to `print_info_string="yes"`

You can call whos() to get the variables in your workspace.

-Tony

[Huckleberry Febbo]

Tony,

Thank you for the quick response. 

Opps! 

I am still having a bit of trouble with this, I managed to get a text file that outputs all of the information, but I was hoping to simply get some sort of a variable with the information to it so that I can simply save the optimization information with my results. For instance, when I use IPOPT in MATLAB, I call it like:

  [x info] = ipopt(x0,funcs,options);

and there are several things stored in the info structure ( I am interested in status, cpu time and the number of iterations) 

I tried using whos(), but I don't see anything that may have these pieces of info.

Any ideas?

Thanks again,

Huck

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Sincerely,

Huckleberry Febbo

[Miles Lubin]

The Ipopt C interface which we use from Julia simply doesn't expose that information. Someone would need to extend that interface.

[Huckleberry Febbo]

Miles,

Thank you for letting me know. 

Huck

[Tony Kelman]

I'd recommend you set an output_file and turn up the file_print_level, then you could post-process that log file.

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Sincerely,

Huckleberry Febbo

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Sincerely,

Huckleberry Febbo

[Huckleberry Febbo]

Tony,

That is good advice, thank you.

Huck

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Sincerely,

Huckleberry Febbo