require 'libRuby'

t1 = TLorentzVector.new
t2 = TLorentzVector.new
t1.DeltaR( t2 )

h1 = TH1F.new
h2 = TH1F.new
h1.Add( h2 )

h3 = TH1F.new
h3.Divide( h1, h2 )