Nonlinear constraint function is undefined at initial point. Fmincon cannot continue.

"Nonlinear constraint function is undefined at initial point. Fmincon cannot continue." This is my error. But i've tried to run my nonlinear constraint function at x0. Nothing wrong happened. How could it be???

[Torsten]

Please show the relevant part of your MATLAB code.

Best wishes

Torsten.

[曜星]

how did you solve the problem?

[Torsten]

how did you solve the problem?

I guess by avoiding that the constraint function returns NaN values for the initial guess x0 you provide.

Before calling "fmincon", test what the constraint function returns for your x0 vector by calling it:

[c,ceq] = constraint_function(x0)

where "constraint_function" stands for the name of your constraint function ("nonlcon" in the documentation).