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pdtri

Inverse Poisson distribution.

SYNOPSIS:

int k;
double m, y, pdtr();
m = pdtri(k, y);

DESCRIPTION:

Finds the Poisson variable x such that the integral from 0 to x of the Poisson density is equal to the given probability y.
This is accomplished using the inverse gamma integral function and the relation

m = igami(k+1, y).

ACCURACY:

See igami.

ERROR MESSAGES:

message condition value returned
domain y < 0 or y >= 1 0.0
k < 0