[Ipopt] print_frequency_iter and print_frequency_time may be set from opt-file only

[Gabriel Hackebeil]

That is expected behavior for Ipopt. If you want to send options-file-only options to Ipopt you can prefix the option name with OF_ and Pyomo will automatically create this file for you and tell Ipopt to use it.

Gabe

> On Feb 29, 2020, at 5:28 PM, Vladimir V. Voloshinov <vladimir.voloshinov at gmail.com> wrote:
> 
> 
> We are using Ipopt for a long time, but recently I found that some options may be set from options file only.
> 
> For example, if I have ipopt.opt file with the line
> print_frequency_iter 100
> than the command
> $ ipopt problem.nl -AMPL "option_file_name=ipopt.opt"
> works fine.
> 
> But when I try the command
> $ ipopt problem.nl -AMPL "print_frequency_iter=100"
> I get the following error message:
> Ipopt 3.12.13: Unknown keyword "print_frequency_iter"
> 
> Currently we have Ipopt 3.12.13 (Linux x86_64), ASL(20180528), gcc 7.4.0.
> 
> Is it a bug of our compilation or "a feature" of Ipopt release?
> 
> Sincerely yours,
> Vladimir Voloshinov.
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