Rooters, Lately I've been using the very useful TProfile2D type of histogram, and would find it very convenient to be able to use Profiles of these histograms. However, projections of TProfile2D's do not behave in the expected way. (I'm using 3.05.02 on Linux) Using the example below, a Projection of just one bin has the values from that bin, but no errors. It would be nice to have the errors displayed. Next, when projecting over more than one bin, one gets the sum of the bins included. Given that it is a Profile histogram, it would make more sense to get the average, with the errors calculated in the same way as the original Profile histogram. regards, Aaron Roodman TProfile2D* aP2D = new TProfile2D("aP2D","test Profile",40,-4.,4.,40,-4.,4.); for (Int_ti=0;i<10000;i++){aP2D->Fill(gRandom->Gaus(),gRandom->Gaus(),gRandom-> Gaus());} aP2D->ProjectionX("prox",20,20)->Draw(); aP2D->ProjectionX("prox",20,21)->Draw(); _______________________________________________________________________________ Prof. Aaron Roodman Stanford Linear Accelerator Center Stanford University E-mail: roodman@slac.stanford.edu 2575 Sand Hill Rd. Phone: 650-926-2705 MS 95 Fax: 650-926-2657 Menlo Park, CA 94025 URL: http://www.slac.stanford.edu/~roodman _______________________________________________________________________________
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