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

Vladimir V. Voloshinov vladimir.voloshinov at gmail.com
Sat Feb 29 17:27:45 EST 2020

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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