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Section: Random Number Generation
Generates a vector of exponential random variables with the specified parameter. The general syntax for its use is
y = randexp(lambda)
 where lambda is a vector containing the parameters for the generated random variables. 
The exponential random variable is usually associated with the waiting time between events in a Poisson random process. The PDF of an exponential random variable is:
![\[ f(x) = \lambda e^{-\lambda x} \]](form_141.png) 
Here is an example of using the randexp function to generate some exponentially distributed random variables
--> randexp(ones(1,6))
ans = 
    0.7969    0.2401    0.5891    1.5129    0.9998    2.7738