unidpdf (Statistics Toolbox)

Discrete uniform probability density function (pdf).

Syntax

Y = unidpdf(X,N)

Description

unidpdf(X,N) computes the discrete uniform pdf at each of the values in X using the corresponding parameters in N. Vector or matrix inputs for X and N must have the same size. A scalar input is expanded to a constant matrix with the same dimensions as the other inputs. The parameters in N must be positive integers.

The discrete uniform pdf is

You can think of y as the probability of observing any one number between 1 and n.

Examples

For fixed n, the uniform discrete pdf is a constant.

y = unidpdf(1:6,10)
y =
    0.1000    0.1000    0.1000    0.1000    0.1000    0.1000

Now fix x, and vary n.

likelihood = unidpdf(5,4:9)
likelihood =
         0    0.2000    0.1667    0.1429    0.1250    0.1111

unidinv unidrnd