[Ipopt] Segmentation fault (LP objFun = 0.0 and mehrotra_algorithm = yes)

Andreas Waechter awaechter.iems at gmail.com
Tue Sep 27 13:32:11 EDT 2011

Hi Chia Weng,

If you believe there is a bug, please submit a ticket on the Ipopt 
website with instruction on how to reproduce the error.



On 09/26/2011 06:04 AM, ChiaWeng Boon wrote:
> Hi,
> I am using IPOPT to find the analytic center of a set of linear
> inequalities, and I am exploiting the concept of linear programming by
> setting the objective function to 0.
> min cx
> s.t. B-Ax>  0.0
> Ipopt gets the analytic center correctly when the "mehrotra_algorithm"
> option is set to yes.  However, I noticed that when "tol" is set to a
> value smaller 1e-6, Ipopt gives a segmentation fault.   And when I set
> "expect_infeasible_problem" to yes while solving an infeasible
> problem, I also get a segmentation fault.  Are there any options that
> I can set to avoid this.
> Another note is that if the objective function cx is not 0, Ipopt
> solves the linear program nicely.  I can also find the analytic center
> by solving max Sum_log_i (B_i -A_i*x), but then this would invoke the
> slower NLP solver.  I would appreciate some advice.
> Regards,
> Chia Weng
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