function l=normal_likelihood_vector(x,mu,sigma2)
% Usage
%   normal_likelihood_vector(x,mu,sigma2)
% 
% where X is a vector of data, MU is a vector of means and SIGMA2 is a
% vector of variances.  If must be the case that X, MU and SIGMA2 have the
% same size.
%
% L is the normal likelihood and is the same size as X

l=(1./sqrt(2*pi.*sigma2)).*exp((-(x-mu).^2)./(2.*sigma2));