Use new methods in Draw()

Dear Rooters,
Using TTree::Draw() I can access member variables and methods defined in the class used to build the tree.

How can I create new methods or new variables, in a new class, and use it in the same Draw()? Eg: the original class gives me the ints a and b and I want to create c=a+b and do tree-> Draw("c"). With MakeClass I only get member variables of the original class but not the methods and add them is not trivial. Is there a better way?

Thanks for any help.
Nico Received on Thu Jan 18 2007 - 20:11:06 CET