Shape parameter
Optional
theta: numberScale paramter
Returns a function for generating random numbers with a gamma distribution with k the shape parameter and theta the scale parameter. The value k must be a positive value; if theta is not specified, it defaults to 1.
Returns a function for generating random numbers with a gamma distribution with k the shape parameter and theta the scale parameter. The value k must be a positive value; if theta is not specified, it defaults to 1.