Voropaev S.G. wrote: > > Hi. > > I want fit to line my data. I create 2 float array x[] and y[] and TGraph > object: > TGraph *tg = new TGraph(N, x,y) > tg->Draw("AP") > tg->Fit("pol1","","AP") > > and I see on window my data point and fitting line. > > Trouble: > > 1. I see very short line. For example, data X range is 0.4-0.7, but line X > range is about 0.54-0.56. > 2. When I work with big N (~50000), parameters of fitting line is not valid. > > What is wrong? > The current version of TGraph in version 1.02 assumes points ordered along X. I have modified TGraph::Fit in the development version to correctly compute the minimum and maximum along the X axis in case of a set of unordered points. Thanks for reporting the feature. Rene Brun
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