#include <iostream>
#include <fstream>

using namespace std;
using namespace RooFit;

void Create(){
  RooRealVar x("x","x",0,10);
  
  RooRealVar mean("mean","mean",5);
  RooRealVar sigma("sigma","sigma",2);
  RooGaussian gss("gss","gss",x,mean,sigma);

  TFile *f = new TFile("Post.root","RECREATE"); 
  RooWorkspace *w = new RooWorkspace("w","workspace");
  w->import(gss);
  w->Write();
  f->Close();
}

void Plot(){
  RooRealVar *x;
  RooAbsPdf *model;

  TFile *in = new TFile("Post.root");
  RooWorkspace *w = (RooWorkspace*)in->Get("w");
  x = w->var("x");
  model = w->pdf("gss");
  RooPlot *P = x->frame();
  model->plotOn(P);
  P->GetYaxis()->SetTitle("");
  P->GetXaxis()->SetTitle("");
  P->SetTitle("");
  P->Print("v"); 

  P->Draw();
}