Funcanimation of matplotlib makes multiple colorbar

Question

I want to make gif animation with FuncAnimation of matplotlib.

Here is the code.

However the output image contains multiple colorbars like this(link)

Does anyone know how to fix this problem ?

If I set

plt.colorbar()

just after or before

ani = animation.FuncAnimation(fig, update, interval=100 ,frames=400)

, it returns RuntimeError: No mappable was found to use for colorbar creation. First define a mappable such as an image (with imshow) or a contour set (with contourf).

If I subsitute plt.colorbar() with if(k==0): plt.colorbar(), image contains same 2 colorbars.

import numpy as np
import matplotlib
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from PIL import Image
import moviepy.editor as edit
from mpl_toolkits.axes_grid1 import make_axes_locatable
def update(k):
    plt.cla() # clear axis

　　#updating Val...

    plt.contourf(X0, Y0, Val, cmap = "bwr")
    plt.colorbar()
    plt.axes().set_aspect("equal")
    plt.title("title-name")

fig = plt.figure()
ani = animation.FuncAnimation(fig, update, interval=100 ,frames=400)
ani.save("out.gif", writer='imagemagick')

Did you try removing `plt.colorbar()` from within the function and putting it outside so that it doesn't get created everytime you call update? Plz share some data so that we can try things — Sheldore, Sep 24 '18 at 13:28
This is for sure not the first time this being asked on Stackoverflow. The answer will depend on what you are trying to achieve: use the same colorbar for all contours or use a dedicated new colorbar for each contour? — ImportanceOfBeingErnest, Sep 24 '18 at 13:37
See e.g. https://stackoverflow.com/questions/48228692/maintaining-one-colorbar-for-maptlotlib-funcanimation/48229469#48229469 — ImportanceOfBeingErnest, Sep 24 '18 at 13:59

score 0 · Accepted Answer · answered Sep 24 '18 at 14:58

I add

plt.colorbar(plt.contourf(X0,Y0,charge,cmap="bwr",levels=np.linspace(-1,1,100,endpoint=True)))

just after

fig=plt.figure()

and it works successfully. This method is adopted from Mr. ImportanceOfBeingErnest's answer(Maintaining one colorbar for maptlotlib FuncAnimation)

Funcanimation of matplotlib makes multiple colorbar

1 Answers1