Using fmincon on a flat surface (solver stopped prematurely)

I have an optimization problem where I am using fmincon as optimizer. The problem is that the surface of my objective function is very flat and because of this the optimizer always stops after some iterations and gives the message "solver stopped prematurely". Is there a work around for this problem? I have already tried increasing the maximum function evaluations and maximum number of iterations but it does not work. Any help will be appreciated... Thanks in advance :)

Answer 1

[Alan Weiss]

We might understand what is going on better if you would give the exact message that fmincon issues, and perhaps show us your exact fmincon call.

Alan Weiss

MATLAB mathematical toolbox documentation