Convert from Graph to histogram

[Gauri_Devi]

Hi all,
I stuck in one code .In this code, I want to convert from graph point(x,y,errors ) to histogram but in histogram , I think possible 2 arguments fill x,y not errors. So, how to plot in histogram graph errors?

[Wile_E_Coyote]

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…

[Gauri_Devi]

OK.Thanks for quick response.I try it.