It is unclear whether you are looking for a general information or for Mathematica code or something else. Generally it is a good ethic, on a forum where people invest their time for free, to show as much of your own work as you can. At least you could point to some definitions or examples that would help to avoid noisy "sentence-per-comment" exchange. And of course what you really should do is to show some Mathematica code that you attempted to solve this problem. Otherwise your Google search skills are probably as good as ours.
