Exiting due to infeasibility: 1 lower bound exceeds the corresponding upper bound.

[S. KUMAR]

Dear Professor,

May you please suggest to me what's might be wrong, if this error occurs.

"Exiting due to infeasibility:  1 lower bound exceeds the corresponding upper bound". 

I am using fmincon solver to solve an NLP problem (ACOPF).

Thanks and Regards

​--

Suraj Kumar

Ph.D. Student

Department of Electrical Engineering

Indian Institute of Technology Roorkee

Roorkee – 247667

India

[Johan Löfberg]

Exactly what is says

>> sdpvar x

>> optimize(0 <= x <= -1,x,sdpsettings('solver','fmincon'))

Exiting due to infeasibility: at least one lower bound exceeds the corresponding upper bound.

[S. KUMAR]

Dear Professor,

Thank you for the response. PFA my boundary constraints and their limits in the command window. I checked all bounds. And there is nothing wrong with boundary constraints. Is there some other possibility or something I am overlooking?

[Johan Löfberg]

how would anyone be able to know that by looking at a picture of parts of your code

in general, simplify simplify simplify delete delete delete everything until it does not happen, then you know where it is

[S. KUMAR]

Okay, thank you, actually this code uses system data (as input) from other platforms (MatPower) that's why sending you the code does not make sense.

[Johan Löfberg]

you can simply save the data created by matpower etc (but I have matpower)

However, you start by simplifying the code by removing everything which doesn't cause the error, which typilaccy will give you a very small infeasible model, and then it will often be obvious what is wrong

[S. KUMAR]

Thank you for the suggestion, I will try that.