import numpy as np
import matplotlib.pyplot as plt


def main():
    #x_axis = np.linspace(-5, 5, 100)
    f_s = 3
    T_s = 1/f_s

    x_axis = np.arange(-5, 5, T_s)
    x_axis_2 = np.linspace(-5, 5, len(x_axis))
    y_axis = x_axis**2

    plt.stem(x_axis, y_axis)
    plt.show()


if __name__ == "__main__":
    main()