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pdtrc
Complemented poisson distribution.SYNOPSIS:
int k;
double m, y, pdtrc();
y = pdtrc(k, m);
DESCRIPTION:
Returns the sum of the terms k+1 to infinity of the Poisson distribution:
inf. j
-- -m m
> e --
-- j!
j=k+1
The terms are not summed directly; instead the incomplete gamma integral is employed, according to the formula:
y = pdtrc(k, m) = igam(k+1, m).
The arguments must both be positive.
ACCURACY:
See igam.