Plotting lognormal distribution

Question

This is the probability density function:

Code:

f=exp(-(((log(x)-log(100)-(.1((.15)^2)/2))^2))/(2*.15^2))/(x(.15)*sqrt(2*pi));

plot(f);

I can't seem to plot this lognormal distribution in Matlab. I am trying to find what percent of this graph is above 100, and don't know how to do that step in code.

Answer 1

Maybe you'd want to give x some values and define f(x) as an ananymous function

f=@(x) exp(-(((log(x)-log(100)-(.1.*((.15).^2)./2)).^2))./(2*.15^2))./(x*.15*sqrt(2*pi));

x = 50:150
plot(x, f(x))

EDIT: Area of the density function for x>=100:

>> quad(f,100,Inf)
ans =  0.50299