[R] why rgamma(2, 2) gives two random number, but rgamma(1.5, 2) gives one?

[Berend Hasselman]

On 03-03-2012, at 21:27, C W wrote:

> I want to get random numbers from Gamma distribution, when I do
> 
> rgamma(1.95, 2)
> [1] 2.313977
> 
> but,
> rgamma(2, 2)
> [1] 2.7985347 0.9415515
> 
> Why do I get two random numbers?  It's the same density function, I don't
> see why the output should be a pair of numbers, is this explained in the
> documentation?

?rgamma

explains it all. First argument is n: number of observations. 1.95 is truncated.

Berend