[R] ! arithmetic

[David Richmond]

you can create your own function:

 > fact <- function(n) prod(1:n)
 > fact(3)
[1] 6
 > fact(10)
[1] 3628800
 > fact(c(3,4))
[1] 6
Warning message:
Numerical expression has 2 elements: only the first used in: 1:n

fact() will work for scalars but doesn't do well with vectors.


Dave Richmond


On Saturday, February 15, 2003, at 07:33  PM, Stan Markus wrote:

>
> Since "!" is a logical operator in R, how does one use it in its 
> arithmetic sense, say to calculate x!/y!(N-y)! ?
>
> Thanks!
>
> Stan