Hi Sara, see an example in tutorial "fit2d.C" Rene Brun On Tue, 26 Aug 2003, Sara VECCHIO wrote: > Hi rooters! > Here's a (maybe stupid) question from a quite new user. > > I have a TH2 histogram scatter plot, in which points follows quite well an > exponential line. I need to check this hypotesis and to get the time > constant. > Using TH1::fit doesn't > work as I would (if I defined a TF2 "y-[0]*exp(x/[1])" all the pad is > filled with black points!). > I've also tried to use TH2::GetCorrelationFactor(1,2) with a log scale > along y axis. But I'm not sure of what this function really does (ROOT > reference guide is sometimes too cryptic for me...), and it also look > insensitive to the log scale. > I vaguely know that things should be easier with TProfile histograms, but > I don't know how to convert a TH2F in a TProfile. > > Could someone help me? > > Thanks in advance, > Sara >
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