The parameter of a gamma distribution, used by
Objects from the Class
Objects can be created by calls of the form
new("GammaParameter", shape, scale).
Usually an object of this class is not needed on its own, it is generated automatically when an object of the class
W=new("GammaParameter",scale=1,shape=1) shape(W) # shape of this distribution is 1. shape(W)=2 # shape of this distribution is now 2.