[Ipopt] nonlinear optimization problem error

[Stefan Vigerske]

Hi,

there is no multistart option in Ipopt.
I guess you could just generate starting points by drawing a random 
number for each variable from its bounds.
For something more elaborate, maybe have a look at the constraint 
consensus method from Chinneck, et.al. (search for "consensus" at 
http://www.sce.carleton.ca/faculty/chinneck/chinneck_pub.shtml).

Stefan

On 11/08/2017 06:37 PM, Barry Barrios wrote:
> Hi,
> 
> I've a nonlinear optimization problem with several constraints, but the
> solver gave this error:
> 
> EXIT: Converged to a point of local infeasibility. Problem may be
> infeasible.
> WARNING - Loading a SolverResults object with a warning status into
> model=unknown; message from solver=Ipopt 3.11.1\x3a Converged to a locally
> infeasible point. Problem may be infeasible.
> WARNING - Loading a SolverResults object with a warning status into
> model=unknown; message from solver=Ipopt 3.11.1\x3a Converged to a locally
> infeasible point. Problem may be infeasible.
> 
> 
> I was wondering if there's a multi-start option or if not, how can one
> implement one, or if there's a way to use multi-start to escape from this
> convergence problem.
> 
> Best,
> Barry
> 
> 
> 
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