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?
Voropaev S.G.