python - Animation using matplotlib with subplots and ArtistAnimation

Question

I am working on an image analysis and I want to create an animation of the final results that includes the time-sequence of 2D data and a plot of the time sequences at a single pixel such that the 1D plot updates as the 2D animation progresses. Then set them up in a subplot side by side The link below has an image of the end result which would ideally be animated.

I keep getting an error: AttributeError: 'list' object has no attribute 'set_visible'. I googled it (as you do) and stumbled across http://matplotlib.1069221.n5.nabble.com/Matplotlib-1-1-0-animation-vs-contour-plots-td18703.html where one guy duck punches the code to set the set_visible attribute. Unfortunately, the plot command does not seem to have such an attribute so I am at a loss as to how I can produce the animation. I have included the monkey patch in the minimal working example below (commented out) as well as a second 'im2' that is also commented out which should work for anyone trying to run the code. Obviously it will give you two 2D plot animations. Minimal working example is as follows:

#!/usr/bin/env python

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

#create image with format (time,x,y)
image = np.random.rand(10,10,10)
image2 = np.random.rand(10,10,10)

#setup figure
fig = plt.figure()
ax1=fig.add_subplot(1,2,1)
ax2=fig.add_subplot(1,2,2)

#set up list of images for animation
ims=[]
for time in xrange(np.shape(image)[1]):
    im = ax1.imshow(image[time,:,:])
 #   im2 = ax2.imshow(image2[time,:,:])
    im2 = ax2.plot(image[0:time,5,5])
 #   def setvisible(self,vis): 
 #       for c in self.collections: c.set_visible(vis) 
 #    im2.set_visible = types.MethodType(setvisible,im2,None) 
 #    im2.axes = plt.gca() 

    ims.append([im, im2])

#run animation
ani = anim.ArtistAnimation(fig,ims, interval=50,blit=False)
plt.show()

I was also curious as to whether anyone knew of a cool way to highlight the pixel that the 1D data is being extracted from, or even draw a line from the pixel to the rightmost subplot so that they are 'connected' in some way.

Adrian

Answer 1

plot returns a list of artists (hence why the error is referring to a list). This is so you can call plot like lines = plot(x1, y1, x2, y2,...).

Change

 im2 = ax2.plot(image[0:time,5,5])

to

 im2, = ax2.plot(image[0:time,5,5])

Adding the comma un-packs the length one list into im2

As for you second question, we try to only have one question per thread on SO so please open a new question.