Matrices in NumPy are subclasses of ndarray. We can create matrices using a special string format. They are, just like in mathematics, two-dimensional (see https://www.khanacademy.org/math/precalculus/precalc-matrices). Matrix multiplication is, as you would expect, different from the normal NumPy multiplication. The same is true for the power operator. We can create matrices with the mat(), matrix(), and bmat() functions.