dirac(n : number) 🡒 ranvar, pure function
Returns a ranvar with a zero probability everywhere, except on
n where the probability is 1. The function fails if a fractional number is passed as argument.
table T = with [| as N |] [| -1 |] [| 0 |] [| 1 |] [| 2 |] show table "" a1b4 with T.N dirac(T.N)