getCosineSimilarity.m

function Cs = getCosineSimilarity(x,y)
% 
% call:
% 
%      Cs = getCosineSimilarity(x,y)
%      
% Compute Cosine Similarity between vectors x and y.
% x and y have to be of same length. The interpretation of 
% cosine similarity is analogous to that of a Pearson Correlation
% 
% R.G. Bettinardi
% -----------------------------------------------------------------
if isvector(x) == 0 || isvector(y) == 0
    error('x and y have to be vectors!')
end
if length(x)~=length(y)
    error('x and y have to be same length!')
end
xy   = dot(x,y);
nx   = norm(x);
ny   = norm(y);
nxny = nx*ny;
Cs   = xy/nxny;

end