poisspdf (Statistics Toolbox)

Poisson probability density function (pdf).

Syntax

Y = poisspdf(X,LAMBDA)

Description

poisspdf(X,LAMBDA) computes the Poisson pdf with parameter settings LAMBDA at the values in X. The arguments X and LAMBDA must be the same size except that a scalar argument functions as a constant matrix of the same size of the other argument.

The parameter,

, must be positive.

The Poisson pdf is:

x can be any non-negative integer. The density function is zero unless x is an integer.

Examples

A computer hard disk manufacturer has observed that flaws occur randomly in the manufacturing process at the average rate of two flaws in a 4 Gb hard disk and has found this rate to be acceptable. What is the probability that a disk will be manufactured with no defects?

In this problem,

= 2 and x = 0.

p = poisspdf(0,2)

p =

    0.1353

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