import numpy as np
import matplotlib.pyplot as plt


def HelloMatPlot():
    x1 = np.linspace(0.0, 5.0)
    x2 = np.linspace(0.0, 2.0)

    y1 = np.cos(2 * np.pi * x1) * np.exp(-x1)
    y2 = np.cos(2 * np.pi * x2)

    fig, (ax1, ax2) = plt.subplots(2, 1)
    fig.suptitle('A tale of 2 subplots')

    ax1.plot(x1, y1, 'o-')
    ax1.set_ylabel('Damped oscillation')

    ax2.plot(x2, y2, '.-')
    ax2.set_xlabel('time (s)')
    ax2.set_ylabel('Undamped')

    plt.show()
