Statistics Toolbox™

geocdf - Geometric cumulative distribution function

Syntax

Y = geocdf(X,P)

Description

Y = geocdf(X,P) computes the geometric cdf 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 cdf is

where .

The result, y, is the probability of observing up to x trials before a success, when the probability of success in any given trial is p.

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 three or fewer tails before getting a heads?

p = geocdf(3,0.5)
p =
  0.9375

See Also

cdf, geopdf, geoinv, geostat, geornd, mle

getlabels

geoinv