opentrees.cxx

#include "TFile.h"
#include "TTree.h"
#include "TCanvas.h"
#include "TF1.h"
#include "TH1F.h"

void opentrees()
{



//	TFile *fr1 = new TFile("simevents-1.root");
	TFile *fr1 = new TFile("simeventsNew.root");
	TFile *fr2 = new TFile("simevents-2.root");
	TFile *fr = new TFile("simevents.root");

	TTree *tr1 = (TTree*)fr1->Get("simevents");
	TTree *tr2 = (TTree*)fr2->Get("simevents");
	TTree *tr = (TTree*)fr->Get("simevents");

	TCanvas *c1 = new TCanvas("name1", "title of canvas");
	c1->Divide(2,2);

	c1->cd(1);
	tr->Draw("E", "E>0");

	c1->cd(2);
	tr1->Draw("E", "E>0");

	c1->cd(3);
	tr2->Draw("E", "E>0");


	c1->cd(4);
	tr->Draw("E", "E>0.95");
	tr1->SetLineColor(kRed);
	tr1->Draw("E", "E>0", "same");
	tr2->SetLineColor(kBlue);
	tr2->Draw("E", "E>0", "same");

	TCanvas *c2 = new TCanvas("name2", "title of canvas");
	c2->Divide(2,2);

	c2->cd(1);
	tr->Draw("E", "E>0.95");
	TH1F *h = (TH1F*)gPad->GetPrimitive("htemp");

	c2->cd(2);
//	fr.cd();
	TH1F *hE = new TH1F("hE", "histogram title", 100, 0.95, 1.4);
	hE->Draw();
	tr->Draw("E >> hE", "", "");

	TF1 *g1 = new TF1("m1","gaus",1.,1.15);
	TF1 *g2 = new TF1("m2","gaus",1.2,1.3);
	// The total is the sum of the three, each has 3 parameters
	TF1 *total = new TF1("mstotal","gaus(0)+gaus(3)",1.,1.3);


	Double_t par[6];

	// Fit each function and add it to the list of functions
	hE->Fit(g1,"R");
	hE->Fit(g2,"R+");


	c2->cd(3);
	TH1F *hEtot = new TH1F("hEtot", "histogram title", 100, 0.95, 1.4);
	hEtot->Draw();
	tr->Draw("E >> hEtot", "", "");
	// Get the parameters from the fit
	g1->GetParameters(&par[0]);
	g2->GetParameters(&par[3]);

	// Use the parameters on the sum
	total->SetParameters(par);
	hEtot->Fit(total,"R+");

		TCanvas *c3 = new TCanvas("name3", "title of canvas 3");
		c3->Divide(2,2);

		c3->cd(1);
		tr1->Draw("E", "E>0.95");
//		TH1F *h = (TH1F*)gPad->GetPrimitive("htemp");

		c3->cd(2);
	//	fr.cd();
		TH1F *hE1 = new TH1F("hE1", "histogram title", 100, 0.95, 1.4);
		hE1->Draw();
		tr1->Draw("E >> hE1", "", "");

		TF1 *g11 = new TF1("m11","gaus",1.,1.15);
		TF1 *g21 = new TF1("m21","gaus",1.2,1.3);
		// The total is the sum of the three, each has 3 parameters
		TF1 *total1 = new TF1("mstotal1","gaus(0)+gaus(3)",1.,1.3);


		Double_t par1[6];

		// Fit each function and add it to the list of functions
		hE1->Fit(g11,"R");
		hE1->Fit(g21,"R+");


		c3->cd(3);
		TH1F *hEtot1 = new TH1F("hEtot1", "histogram title", 100, 0.95, 1.4);
		hEtot1->Draw();
		tr1->Draw("E >> hEtot1", "", "");
		// Get the parameters from the fit
		g11->GetParameters(&par1[0]);
		g21->GetParameters(&par1[3]);

		// Use the parameters on the sum
		total1->SetParameters(par1);
		hEtot1->Fit(total1,"R+");


		c3->cd(4);
		TH1F *hEtot11 = new TH1F("hEtot11", "histogram title", 100, 0.95, 1.4);
		tr1->Draw("E >> hEtot11", "", "");

		Double_t par12[6];
		total1->GetParameters(&par12[0]);
		TF1 *gLow = new TF1("mLow","gaus",0.95,1.2);
		TF1 *gHigh = new TF1("mHigh","gaus",1.0,1.4);
		gHigh->SetLineColor(kGreen);

		gLow->SetParameter(0, par12[0]);
		gLow->SetParameter(1, par12[1]);
		gLow->SetParameter(2, par12[2]);

		gHigh->SetParameter(0, par12[3]);
		gHigh->SetParameter(1, par12[4]);
		gHigh->SetParameter(2, par12[5]);

		gLow->Draw("same");
		gHigh->Draw("same");




}