*** Dirk Meier wrote : > > > Hi, > > supposed I have a splitted Tree with the float values X,Y,Z. > Is it then possible to put these values into a 2 dimensional histogram > with weight Z summing up in the bin at X,Y ? > I can do this in a loop reading events from the tree and filling a > histogram, but I would prefer it done in a command like > Draw("Z:Y:X>>h2") . Is here a solution? > > Dirk > > > > Hi Dirk, I normally do Draw("Y:X","1*Z") which fills a (lego) 2D histo in which Z is used as the weight for the X-Y cell. Cheers, _/_/ _/ _/ _/_/_/_/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/_/ _/ _/_/ _/ _/ _/ _/ _/ _/ _/ _/_/_/_/ _/ _/ *----------------------------------------------------------------------* Dr. Nick van Eijndhoven Department of Subatomic Physics email : nick@fys.ruu.nl Utrecht University / NIKHEF tel. +31-30-2532331 (direct) P.O. Box 80.000 tel. +31-30-2531492 (secr.) NL-3508 TA Utrecht fax. +31-30-2518689 The Netherlands WWW : http://www.fys.ruu.nl/~nick Office : Ornstein lab. 172 ---------------------------------------------------------------------- tel. +41-22-7679751 (direct) CERN PPE Division / ALICE exp. tel. +41-22-7675857 (secr.) CH-1211 Geneva 23 fax. +41-22-7679480 Switzerland CERN beep : 13+7294 Office : B 160 1-012 *----------------------------------------------------------------------*
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