Hi rooters, we made a pretty impressive (at least we think so :-) Online analysis and display program based on root wich is based on a custom event class. I tried to figure out how to use the TCut and TFormula objects to make cuts on our class. The point is we want to display only such events in our online display that fullfill certain criteria. The idea is to have a cut function that gets an event and a TCut Object as paramter and returns TRUE or FALSE depending whether the event has to be further processed or not. Does anybody had a simialr problem ? Any sample source code ? Actually TTree.Draw(Expr., Select.) does nothing else. Hicks, Norbert
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