% trunlerch_pdf.m - evaluatess a Truncated Lerch Probability Density.
% See Auxiliary Information for Article, "Some Properties of the Lerch Family of Discrete Distributions",
% S.V. Askenov and M.A. Savageau, preprint submitted to Elsevier Science,
% 1 February, 2008.
% Created by Jim Huntley, 12/16/08
function [pdf] = trunlerch_pdf(n, a, b, z, s, ups)
c1 = z^a * lerch(z, s, ups+a);
c = 1 / (c1 - z^(b+1) * lerch(z,s,ups+b+1));
pdf = c * z^n / (ups+n)^s;