[Ipopt] Equality in lower and upper simple bounds

Andreas Waechter awaechter.iems at gmail.com
Wed Mar 28 10:45:35 EDT 2012

Hi Sylvian,
> I just read in the documentation the following statement :
> "Note that if you have fixed variables (both upper and lower bounds 
> are equal), Ipopt may remove these variables from the problem 
> internally and not include them in the problem statistics."
> I was wondering when does it happens and when it doesn't? Any way to 
> predict?

By default, fixed variables are removed.  See the option 


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