| Statistics Toolbox | |
Poisson probability density function (pdf).
Syntax
Y = poisspdf(X,LAMBDA)
Description
poisspdf(X,LAMBDA)
computes the Poisson pdf at each of the values in X using the corresponding parameters in LAMBDA. Vector or matrix inputs for X and LAMBDA must be the same size. A scalar input is expanded to a constant matrix with the same dimensions as the other input. The parameters in LAMBDA must all be positive.
where x can be any nonnegative 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
See Also
pdf, poisscdf, poissfit, poissinv, poissrnd, poisstat
| | poissinv | poissrnd | |