function [m,v,p]=discretenorm(x,lambda)
%outputs the value of the discrete normal distribution on the points x
%together with the mean m  and the variance v of the distribution.
p=lambda(1)*x+lambda(2)*x.^2;
p=exp(-p);
p=p/sum(p);
m=sum(x.*p);
v=sum(p.*(x-m).^2);