void translate()
{
   c = new TCanvas("c","c",200,10,700,500);
   c->Divide(2,1);

   TH1 *h1 = new TH1F("h1","h1",100,-4,4);

   gRandom->SetSeed();
   Float_t px, py;

   for (Int_t i = 0; i < 25000; i++) {
      gRandom->Rannor(px,py);
      Float_t random = gRandom->Rndm(1);
      h1->Fill(px);
   }

   c->cd(1);
   h1->Draw();
   c->cd(2);
   TranslateTH1(h1,2.)->Draw();
}

TH1 *TranslateTH1(TH1 *h, Double_t t)
{
   Double_t xmin = h->GetXaxis()->GetXmin()+t;
   Double_t xmax = h->GetXaxis()->GetXmax()+t;
   Int_t n = h->GetNbinsX();
   TH1 *ht = new TH1F("translated", h->GetTitle(), n, xmin, xmax);
   for (int i=1; i<=n; i++) {
      ht->SetBinContent(i,h->GetBinContent(i));
   }
   ht->SetEntries(h->GetEntries());
   return ht;
}