#include "TH1F.h"
#include "TCanvas.h"
#include "TFile.h"
#include "TRandom.h"

void plot(const char *outname)
{
  //////////////////////////////////////////////////////////////////////////////
  //
  //Set up Canvasses
  //
  //////////////////////////////////////////////////////////////////////////////

  TCanvas * VarCanvas = new TCanvas("VarCanvas","VarCanvas",0,0,600,700);
  VarCanvas->Divide(1,1);
  
  TH1F *var    = new TH1F("var"," Random",20,0,10);  
  gRandom->SetSeed();

  VarCanvas->cd(1);
  for ( Int_t i=0; i<500; i++) 
    { 
      Float_t random = gRandom->Rndm(1)*10;    
      var->Fill(random);         
    }
  var->Draw();
  //////////////////////////////////////////////////////////////////////////////
  TFile *outfile;
  char name[200];
  sprintf(name,"%s.root",outname);
  
  outfile = new TFile(name,"RECREATE","ROOT file with histograms");
  outfile->Close();
  
  outfile = new TFile(name,"UPDATE","ROOT file with histograms");
  
  VarCanvas->Write();

  outfile->Close();
  
}