[Ipopt] time as optimization variable

Andreas Waechter andreasw at watson.ibm.com
Mon Apr 27 10:07:51 EDT 2009

Hi Dominik,

Yes, you can just put a small positive bound for your t variables, such as 
1e-7.  Then this bound will be relaxed (with all the other ones) by 
something on the order of 1e-8, so that the final bound will still be 


On Mon, 27 Apr 2009, Dominik Skanda wrote:

> Hi All,
> I have in my optimization problem time as a optimization variable. For 
> the bounds I set t>=0.
> This seems at the first look Ok. But Ipopt is relaxing the bounds and i 
> get negative time points during my optimization problem. Is there a way 
> to strictly force the time to be bigger zero but relaxing the other 
> bounds?
> Many thanks in advance
> Dominik
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