Matlab/Octave 1-of-K representation

Question

I have a y of size 5000,1 (matrix), which contains integers between 1 and 10. I want to expand those indices into a 1-of-10 vector. I.e., y contains 1,2,3... and I want it t

Answer 1

I think you mean:

y = [2 5 7];
Y = zeros(5000,10);
Y(:,y) = 1;

After the question edit, it should be this instead:

y = [2,5,7,9,1,4,5,7,8,9....]; //(size (1,5000))
for i = 1:5000
    Y(i,y(i)) = 1;
end