19 oct

[these_gilles.git] / THESE / codes / graphe / Ncut_9 / X2distances.m

function distances = X2distances(X,Sigma);\r
%Timothee Cour, 2004\r
[n,k] = size(X);\r
if nargin >= 2\r
    X = X*inv(sqrtm(Sigma));\r
end\r
temp = sum(X.*X,2);\r
temp = repmat(temp,1,n);\r
distances = -2*X*X' + temp + temp';