Realtime-Plot

import matplotlib.pyplot as plt
import numpy as np


i = np.sin(np.linspace(0, np.pi * 2, 1000))
q = np.cos(np.linspace(0, np.pi * 2 * 4, 1000))
plt.ion()

while True:
    plt.pause(1/1000)
    i = np.roll(i, 10)
    q = np.roll(q, 5)
    m = np.sqrt(i**2 + q**2)
    plt.cla()
    plt.plot(i)
    plt.plot(q)
    plt.plot(m)
    plt.legend(['iData', 'qData', 'magnitude'])