function y = weibulld(alpha, lambda, t)
% WEIBULLD y = weibulld(alpha, lambda, t) Weibull distribution function
% Version of 1/24/91
% Distribution function for X ~ Weibull (alpha, lambda, 0)
% t is a matrix of positive evaluation points
% y = P(X<=t) (a matrix of the same dimensions as t)
y = 1 - exp(-lambda*(t.^alpha));