GAMMALN Log Gamma Function

Section: Mathematical Functions

Usage

Computes the natural log of the gamma function for real arguments. The gammaln function takes only a single argument 
  y = gammaln(x)

where x is either a float or double array. The output vector y is the same size (and type) as x.

Example

Here is a plot of the gammaln function over the range [-5,5]. 
--> x = linspace(0,10);
--> y = gammaln(x);
--> plot(x,y); xlabel('x'); ylabel('gammaln(x)');

which results in the following plot.