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Understanding the code snippet

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atan
atan 2019-4-10
回答： Star Strider 2019-4-10
I do not understand what this is doing exactl Can anyone help?
eye_matrix = eye(num_labels);
y_matrix = eye_matrix(y,:);

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Star Strider
Star Strider 2019-4-10
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.

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