Hi Vuko, Do: tree.Draw("(run<LIMIT)*(var1+var2) + (run>=LIMIT)*(var3+var4)"); Rene Brun Vuko Brigljevic wrote: > > Hi root experts, > > Still learning how to do analysis in root... > > I am trying to do something I would do with a nt/loop and > a fortran function in paw: > - I am looping over a tree > - for each "event" in the tree, I want to plot the sum of > variables but which ones depends from another variable, > let's call it run number, e.g: > > I would like a tree->Draw() which plots: > i) var1+var2 if (run<LIMIT) > ii) var3+var4 if (run>=LIMIT) > > where var{1,4} and run are all separated branches in the > tree, all of them elementary types (integers or floats). > - using root 3.02/07 > > How do I go about doing something like that in root? If > something like that is already documented somewhere and > you know where (usermanual or other roottalk thread, > pleast just point me to it). > > Thanks, > > Vuko > > ======================================================================== > Vuko Brigljevic | Mail : SLAC, Mail Stop 41 > Lawrence Livermore National Laboratory | P.O. Box 4349, Stanford > Nuclear and Particle Physics Division | CA 94309, USA > | SLAC-Office : B280- room 143 > Member of the BaBar Collaboration | Phone : +1-650-926 8512 > <vuko@slac.stanford.edu> <http://www.slac.stanford.edu/~vuko> > ========================================================================
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