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Geometric probability density function


Y = geopdf(X,P)


Y = geopdf(X,P) computes the geometric pdf at each of the values in X using the corresponding probabilities in P. X and P can be vectors, matrices, or multidimensional arrays that all have the same size. A scalar input is expanded to a constant array with the same dimensions as the other input. The parameters in P must lie on the interval [0 1].

The geometric pdf is

where .


Suppose you toss a fair coin repeatedly. If the coin lands face up (heads), that is a success. What is the probability of observing exactly three tails before getting a heads?

p = geopdf(3,0.5)
p =

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