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Hi Sylvian,
<blockquote
cite="mid:76EDA146-A435-4DD2-8538-8D20D3A4A276@ann.jussieu.fr"
type="cite">
<div>I just read in the documentation the following statement :</div>
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<div style="margin-top: 0px; margin-right: 0px; margin-bottom:
0px; margin-left: 0px; font: normal normal normal 10px/normal
Helvetica; ">"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."</div>
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0px; margin-left: 0px; font: normal normal normal 10px/normal
Helvetica; "><br>
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<div>I was wondering when does it happens and when it doesn't? Any
way to predict?</div>
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<br>
By default, fixed variables are removed. See the option
"fixed_variable_treatment."<br>
<br>
Regards,<br>
<br>
Andreas
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