Using NMinimize for finding global minima, one can choose the DifferentialEvolution method. You can find a (not so) detailed ...
OptionValue allows for recent versions of Mathematica (I think as from 7) to easily access optional parameters if they are explicitely given to a function or their default values otherwise. For big ...
I am puzzled by how AbsoluteOptions works with Graph objects. I would have expected that one could use it to obtain all the ...