Notebook testing

First section

import numpy as np
import matplotlib.pyplot as plt

Numpy Array in subsection

a = np.array([[1,2,3],
              [4,5,6],
              [7,8,9]])

a

array([[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9]])

Plot in subsection

plt.figure()
plt.plot(range(5))
plt.show()