Create an histogram with a txt file

[Wile_E_Coyote]

In the posts given below, you can find examples of how to create a histogram from a graph.

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…

Problem in fitting (in function!)

{ TGraphErrors *g = new TGraphErrors("data.txt", "%lg %lg %lg"); // g->Sort(); // just a precaution Int_t n = g->GetN(); 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()[(i - 1)] + g->GetX()[i]) / 2.0; } TH1D *h = new TH1D("h", "spectrum;x-value;#counts", n, x); for (Int_t i = 0; i < n; i++) { h->SetBinContent(i + 1, g->Ge…