Create a variable binning TH1D knowing only bin centers and contents

[Wile_E_Coyote]

Adding statistics in plot from ascii file without fitting

You can convert a graph into a histogram: { TGraph *g = new TGraph("m1.txt"); // g->Sort(); // just a precaution Int_t n = g->GetN(); // note: if the graph's points "x coordinates" are not equidistant, // they will usually not coincide with the histogram's "bin centers" Double_t *x = new Double_t[(n + 1)]; x[0] = (3.0 * g->GetX()[0] - g->GetX()[1]) / 2.0; x[n] = (3.0 * g->GetX()[(n - 1)] - g->GetX()[(n - 2)]) / 2.0; for (Int_t i = 1; i < n; i++) { x[i] = (g->GetX()[(…

Facing Problem while fitting

The first parameter of “gaus” is the “peak’s height” while the first parameter of “gausn” is the “peak’s area”. In both cases, the second parameter is the “peak’s mean” (i.e. the “peak’s position”). { TGraph *g = new TGraph("eu_gu_1.dat"); // g->Sort(); // just a precaution TF1 *f1 = new TF1("f1", "gausn(0) + pol1(3)", 400., 435.); // linear background f1->SetParameters(14000., 415., 2., 0., 0.); g->Fit("f1", "BR+"); TF1 *f2 = new TF1("f2", "gausn(0) + pol1(3)", 1160., 1200.); f2…