betacdf (Statistics Toolbox)

Beta cumulative distribution function (cdf).

Syntax

P = betacdf(X,A,B)

Description

betacdf(X,A,B) computes the beta cdf with parameters A and B at the values in X. The arguments X, A, and B must all be the same size except that scalar arguments function as constant matrices of the common size of the other arguments.

The parameters A and B must both be positive and x must lie on the interval
[0 1].

The beta cdf is:

The result, p, is the probability that a single observation from a beta distribution with parameters a and b will fall in the interval [0 x].

Examples

x = 0.1:0.2:0.9;
a = 2;
b = 2;
p = betacdf(x,a,b)

p = 

    0.0280    0.2160    0.5000    0.7840    0.9720

a = [1 2 3];
p = betacdf(0.5,a,a)

p =

    0.5000    0.5000    0.5000

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