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geopdf

Geometric probability density function

Syntax

Y = geopdf(X,P)

Description

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 .

Examples

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 =
  0.0625

See Also

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