Statistics Toolbox

lognpdf

Lognormal probability density function (pdf).

Syntax

Y = lognpdf(X,MU,SIGMA)

Description

Y = logncdf(X,MU,SIGMA) computes the lognormal cdf at each of the values in X using the corresponding means in MU and standard deviations in SIGMA. Vector or matrix inputs for X, MU, and SIGMA must have the same size, which is also the size of Y. A scalar input for X, MU, or SIGMA is expanded to a constant matrix with the same dimensions 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.

See Also

logncdf, logninv, lognrnd, lognstat, pdf

logninv

lognrnd