[Ipopt] Equality in lower and upper simple bounds

Sylvain Auliac auliac at ann.jussieu.fr
Wed Mar 28 07:43:23 EDT 2012

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?

Sylvain Auliac
Laboratoire Jacques-Louis Lions
Université Pierre et Marie Curie
mail: auliac at ann.jussieu.fr
tel : 01 44 27 71 70

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