#include <TGraph.h>
#include <TH1D.h>
#include <TCanvas.h>

void DrawTest(){
	TCanvas *canv=new TCanvas("canv","canv");
	canv->Divide(2,1);
	TH1D *histo=new TH1D("h","h",100,-1.,1.);
	histo->SetDirectory(0);
	histo->FillRandom("gaus");
	canv->cd(1);
	histo->Draw();
	TGraph *graph=new TGraph(histo);
	canv->cd(2);
	graph->Draw();
	return;
}