[Ipopt] Known variables as unknowns in Ipopt model

Stefan Vigerske stefan at math.hu-berlin.de
Thu Feb 1 02:14:48 EST 2018


if you fix your variables by using the variable bounds, then that 
shouldn't affect performance much.
Adding constraints of the form x=4 may harm a bit more.


On 02/01/2018 07:59 AM, Hisham Abdulla wrote:
> For the sake of simplicity in my non-linear optimization model, I have
> assumed that many known variables as unknown and then I provided its real
> value as constraint. I haven't modeled the problem completely yet, so I
> cannot compare results.
> I'm using Ipopt which uses interior-point algorithm to solve the problem.
> Will it, in any chance ,affect my results? My concern is whether the
> constraint values is satisfied or approximated. Since I'm a beginner in
> optimization, the question might be too silly, so please forgive it.
> Hisham
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