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Distfun >> Distfun > LogNormal > distfun_lognrnd

distfun_lognrnd

Lognormal random numbers

Calling Sequence

x = distfun_lognrnd ( mu , sigma )
x = distfun_lognrnd ( mu , sigma , [m,n] )
x = distfun_lognrnd ( mu , sigma , m , n )

Parameters

mu :

a matrix of doubles, the average.

sigma :

a matrix of doubles, the standard deviation. sigma>0.

m :

a 1-by-1 matrix of floating point integers, the number of rows of x

n :

a 1-by-1 matrix of floating point integers, the number of columns of x

x:

a matrix of doubles, the positive random numbers.

Description

Generates random variables from the lognormal distribution function.

Any scalar input argument is expanded to a matrix of doubles of the same size as the other input arguments.

Examples

// Test both mu and sigma expanded
x = distfun_lognrnd(1:6,(1:6)^-1)

// Test sigma expansion
x = distfun_lognrnd(1:6,2.0)

// Test mu expansion
x = distfun_lognrnd(1.0,1:6)

// Test with v
x = distfun_lognrnd(0,1,[3 2])

// Test with m, n
x = distfun_lognrnd(0,1,3,2)

// Make a plot of the actual distribution of the numbers
scf();
mu = 2;
sigma = 3;
x = distfun_lognrnd(mu,sigma,1,1000);
histplot(10,log(x));
x = linspace(-10,10,1000);
y = distfun_normpdf(x,mu,sigma);
plot(x,y)
xtitle("Lognormal random variables","Log(X)","Density");
legend(["Empirical","PDF"]);

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