The parameter of an exponential distribution, used by Exp-class and DExp-class
Objects from the Class
Objects can be created by calls of the form
Usually an object of this class is not needed on its own, it is generated automatically when an object of the class Exp
W=new("ExpParameter", rate=1) rate(W) # rate of this distribution is 1. rate(W)=2 # rate of this distribution is now 2.