Understanding the code snippet

I do not understand what this is doing exactl Can anyone help?

eye_matrix = eye(num_labels);
y_matrix = eye_matrix(y,:);

Answer 1

[Star Strider]

By inspection, it generates an identity matrix with dimensions (num_labels x num_labels), then assigns the ‘y’ row of it to the ‘y_matrix’ vector. That vector would be all zeros, except for column ‘y’.

Beyond that, I have no idea what the purpose is.