I have question regarding the use of the RelLineSrchBnd and RelLineSrchBndDuration options for fmincon.
I am not sure if I understand the description given in the help documentation. It says that it sets the relative bound on the line search step such that total displacement in x satisfies |delta xi| =< RelLineSrchBnd*max(|xi|,|typical xi|). Could someone explain to me what this means, and under what circumstances adjusting this option would be useful? Is it common to use this option?