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];
[m,n] = size(x);
mu = sum(x)/m;
sigma = zeros(n,n);
for i = 1:m
sigma = sigma + ((x(i,:)-mu)')*(x(i,:)-mu);
end
sigma = sigma/m-1
[w,d] = eig(sigma)
w1 = w(:,n);
w2 = w(:, n-1);
w3 = w(:, n-2);
close all
hold on
for i=1:m
plot3(x(i,:)*w1, x(i,:)*w2, x(i,:)*w3, 'or')
end