From 974877839367f31224ec220d64fe1df933caa5f5 Mon Sep 17 00:00:00 2001
From: david <david@hameipe.de>
Date: Tue, 7 May 2019 13:30:45 +0200
Subject: [PATCH] Root ex3

---
 root/macro.C | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/root/macro.C b/root/macro.C
index 832b782..45b6a44 100644
--- a/root/macro.C
+++ b/root/macro.C
@@ -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() {