Strange errors from IntegralError

[Wile_E_Coyote]

The type of a GetCovarianceMatrix() and GetMatrixArray() and how to get them in a multiple fitted functions case?

TFitResultPtr r_total = h1->Fit(total, "LRS"); TMatrixD c_total = r_total->GetCovarianceMatrix(); TMatrixD c_g1 = c_total.GetSub(0, 2, 0, 2); // gausn(0) TMatrixD c_g2 = c_total.GetSub(3, 5, 3, 5); // gausn(3) TMatrixD c_bg = c_total.GetSub(6, 8, 6, 8); // pol2(6) or "broken line" (6) Double_t *p_total = total->GetParameters(); Double_t *p_g1 = p_total + 0; // gausn(0) Double_t *p_g2 = p_total + 3; // gausn(3) Double_t *p_bg = p_total + 6; // pol2(6) or "broken line" (6) Then, e.g., for the “bg”…

TH1F variable bin width

Using the "60Codata.txt" file (attached in another post here), try this: { const Bool_t fit_with_fixed_background = kFALSE; // kFALSE or kTRUE const char *filename = "60Codata.txt"; TGraph *g0 = new TGraph(filename, "%lg %lg %*lg"); // X axis = channels g0->SetTitle("g0;Channel number;Energy"); // energy calibration TGraph *g1 = new TGraph(filename, "%lg %*lg %lg"); // X axis = channels g1->SetTitle("g1;Channel number;Counts"); TGraph *g2 = new TGraph(filename, "%*lg %lg %lg");…

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