lognpdf (Statistics Toolbox)

Lognormal probability density function (pdf).

Syntax

Y = lognpdf(X,MU,SIGMA)

Description

Y = logncdf(X,MU,SIGMA) computes the lognormal cdf with mean MU and standard deviation SIGMA at the values in X.

The size of Y is the common size of X, MU and SIGMA. A scalar input functions as a constant matrix of the same size as the other inputs.

The lognormal pdf is:

Example

x = (0:0.02:10);
y = lognpdf(x,0,1);
plot(x,y);grid;xlabel('x');ylabel('p')

Reference

Mood, A. M., F.A. Graybill, and D.C. Boes, Introduction to the Theory of Statistics, Third Edition, McGraw Hill 1974 p. 540-541.