in TChain I would like to perform math on a leaf in the root tree. basically, I would like to do something such as
chain->Draw("event.blah1*e^(event.blah2)", *cut1 && *cut2);
the restriction is that the first argument in the " " must be a string.
unfortunately I only know how to code numbers into a string via Form, and then %d or %g referring to two arguments. I am not sure how to code in expressions such as e^(variable).