nbinpdf (Statistics Toolbox)

Negative binomial probability density function.

Syntax

Y = nbinpdf(X,R,P)

Description

nbinpdf(X,R,P) returns the negative binomial probability density function with parameters R and P at the values in X.

Note that the density function is zero unless X is an integer.

The size of Y is the common size of the input arguments. A scalar input functions as a constant matrix of the same size as the other inputs.

The negative binomial pdf is:

The negative binomial models consecutive trials each having a constant probability, P, of success. The parameter, R, is the number of successes required before stopping.

Example

x = (0:10);
y = nbinpdf(x,3,0.5);
plot(x,y,'+')
set(gca,'Xlim',[-0.5,10.5])