Python, Machine Learning, Artificial Intelligence, Programming, Matrix.
brackets : instead of the row number (because we want all rows), and the column number. >>> A = np.array([[1,2,3,4],[5,6,7,8],[9,10,11,12]]) >>> print(A[:,1]) [ 2 6 10] Matrix Operations When executing mathematical operations we can use the standard operators to perform value-wise operations. For