[FIXED] matplotlib artist animation : title or text not changing

Issue

I tried using matplotlib's ArtistAnimation. The text and titles of the figure are supposed to change in each frame, but they don't. I have read tons of posts on similar problems, but I still don't understand what is the solution. The demos don't show updating titles as far as I could find.

If anybody out there knows, I would be grateful!

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

fig =plt.figure()    
ims=[]

for iternum in range(4):
    plt.title(iternum)
    plt.text(iternum,iternum,iternum)
    ims.append([plt.scatter(np.random.randint(0,10,5), np.random.randint(0,20,5),marker='+'    )])
    #plt.cla()


ani = animation.ArtistAnimation(fig, ims, interval=500, blit=False,
                              repeat_delay=2000)
plt.show()

Solution

To animate artists, you have to return a reference to each artists in your ims[] array, including the Text objects.

However it doesn't work for the title, I don't know why. Maybe somebody with a better understanding of the mechanisms involved will be able to enlighten us.

Nevertheless, the title is just a Text object, so we can produce the desired effect using:

fig = plt.figure()
ax = fig.add_subplot(111)
ims=[]

for iternum in range(4):
    ttl = plt.text(0.5, 1.01, iternum, horizontalalignment='center', verticalalignment='bottom', transform=ax.transAxes)
    txt = plt.text(iternum,iternum,iternum)
    ims.append([plt.scatter(np.random.randint(0,10,5), np.random.randint(0,20,5),marker='+'    ), ttl, txt])
    #plt.cla()


ani = animation.ArtistAnimation(fig, ims, interval=500, blit=False,
                              repeat_delay=2000)

Answered By - Diziet Asahi