david/bsc-exc
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Root ex3

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david 2019-05-07 13:30:45 +02:00
parent e65ae076ac
commit 9748778393
1 changed files with 20 additions and 2 deletions
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root/macro.C
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@ -1,14 +1,32 @@
#include "TCanvas.h"
#include "TROOT.h"
#include "TH1D.h"
#include "TF1.h"
#include "TFile.h"
#include <iostream>
using namespace std;
void macro() {
TFile* f = new TFile("data.root");
TH1D* h;
f->GetObject("combined", h);
std::cout << h->GetEntries() << std::endl;
h->Draw(" A ");
TF1* background = new TF1("background", "[0] + x*[1] + [2] * exp(-[3] * x)",
1, 299);
TF1* gauss = new TF1("gauss", "[0]*exp(-0.5 * (x-[1])^2/[2]^2)",
140, 210);
TF1* combined = new TF1("combined", "background+gauss", 0, 300);
h->Fit(combined, "", "", 0, 300);
gauss->SetParameters(0.013, 170, 20);
combined->SetParameter(4, 0.004);
combined->SetParameter(5, 173);
combined->SetParameter(6, 10);
cout << "X^2: " << h->Chisquare(combined) << endl;
//cout << background->GetParameters() << endl;
background->SetLineColor(kRed);
h->Draw();
//gauss->Draw("Same");
combined->Draw("Same");
}
int main() {