Simple Matplotlib Animate Not Working

I am trying to run this code below but it is not working properly. I've followed the documentation from matplotlib and wonder what is wrong with this simple code below. I am trytin

Solution 1:

You need to create an actual plot. Just updating a NumPy array is not enough. Here is an example that likely does what you intend. Since it is necessary to access the same objects at multiple places, a class seems better suited as it allows to access instance attributes via self:

import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation



class MyAni(object):
    def __init__(self, size=4800, peak=1.6):
        self.size = size
        self.peak = peak
        self.fig = plt.figure()
        self.x = np.arange(self.size)
        self.y = np.zeros(self.size)
        self.y[0] = self.peak
        self.line, = self.fig.add_subplot(111).plot(self.x, self.y)

    def animate(self, i):
        self.y[i - 1] = 0
        self.y[i] = self.peak
        self.line.set_data(self.x, self.y)
        return self.line,

    def start(self):
        self.anim = animation.FuncAnimation(self.fig, self.animate,
            frames=self.size, interval=20, blit=False)

if __name__ == '__main__':
    ani = MyAni()
    ani.start()

    plt.show()