Hi, You can do this from the TreeViewer. You first need to create your histogram with the range that you need. Then you need to set the label of the TPaveVar (white rectangle) that overlap the button named Hist to the name of your histogram. This will force the TreeViewer to use that Histogram for filling. One caveat, the Histogram must be in the current directory. Philippe Canal. -----Original Message----- From: owner-roottalk@hpsalo.cern.ch [mailto:owner-roottalk@hpsalo.cern.ch]On Behalf Of Hongquan Niu Sent: Thursday, October 14, 1999 12:11 PM To: roottalk@hpsalo.cern.ch Subject: TTree Viewer Hi rooters, A beginner's problem. How can I do similar thing in Tree Viewer like project a variable of ntuple into a histogram which has certain range. All of this I assume I should be able to do it in Tree Viewer, but I tried and did not successeed. Thanks, Hongquan
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