Warning

## Python Help for Typical Situations in Homeworks

#### Packages

The following packages should be used. In the code examples, we assume that they are imported with the aliases as bellow.

import numpy as np                # for matrix computation and linear algebra
import matplotlib.pyplot as plt   # for drawing and image I/O
import scipy.io as sio            # for matlab file format output

#### Matrices

When there is a matrix required as and output data, we mean matrix implemented as np.array.