Matthias Vitt wrote: > > Hi there, > thankx for the help. I got another question (I hope after that one I can > keep silent:-)..). Fitting data to a histogram is quite straight > forward, but I cannot see how data is fitted which is stored in two > arrays x and y that contain the x- and y-values of a pair of data > points (f.ex. data where you measured the amplitude of a signal at > certain, discrete temperatures, so you get datapoints like (12.354,24.5) > and (16.7,30.25) etc.). Is there an easy way to accomplish this task? > Any help is appreciated, Look at the two examples in the tutorials: http://root.cern.ch/root/html/examples/graph.C.html and http://root.cern.ch/root/html/examples/gerrors.C.html To fit a graph object, use TGraph::Fit (like for histograms) gr->Fit("pol3") will fit the graph pointed by gr with a polynomial of degree 3. Rene Brun
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