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Section: Random Number Generation
Generates random variables with a negative binomial distribution. The general syntax for its use is
y = randnbin(r,p)
 where r is a vector of integers representing the number of successes, and p is the probability of success. 
A negative binomial random variable describes the number of failures x that occur in x+r bernoulli trials, with a success on the x+r trial. The pdf is given by 
![\[ P_{r,p}(x)=\left(\begin{matrix} x+r-1 \\ r-1 \end{matrix}\right)p^r(1-p)^x. \]](form_148.png) 
Here we generate some negative binomial random variables:
--> randnbin(3*ones(1,4),.01) ans = 437 215 199 187 --> randnbin(6*ones(1,4),.01) ans = 471 1233 768 338