Using fmincon, is it possible setting a limit for Line Search Steplength? After some iterations the steplength is about 1e-5 and the f(x) is constant during the following iterations. It seems the steplength is too small and the algorithm does not further explore the domain. In my opinion this is a local minimum. Setting a limit for the inferior steplength (let's say 1e-2), can it help to avoid this local minimum?
Maybe I have to deal with options 'DiffMinChange' and 'DiffMaxChange' What is 'RelLineSrchBnd' for?