[Matplotlib-users] Basic matshow question

[JBB <jea...@gm...>]

Hello,

I am relatively new to Python, numpy, matplotlib, etc., with a 
reasonable amount of Matlab experience.

I am trying to do some simple array visualizations before moving on to 
specific work.

e.g. I have a 5x5x10 array and I'd like to see each 5x5 piece as a 
"frame" with a short pause in between.  I realize there are animation 
methods and such but I think the  code below ought to work and don't 
understand what I'm getting.

Expect: A figure window with the first 5x5 piece of the array, a short 
pause, a new figure window overwriting the old one with the second 5x5 
piece, and so on. Equivalent code in Matlab does this.

Result:  Figure window opens, nothing gets drawn in it, there's a pause, 
the window closes, and another window opens in the same location with 
nothing in it, and so on.

If I refresh the kernel, create the 3D array, and manually show one 
slice, it works.  As soon as I run the loop, all I get from then on is 
blank windows whether I do it within a loop or type the matshow, show 
commands.

This happens in iPython with and without the notebook interface.

I'm trying to understand Matplotlib in some detail and am watching the 
SciPy2014 videos along with RTFM.
https://www.youtube.com/watch?v=A2adyFMsut0 et.seq.

So far, I've come up empty in figuring out what I'm doing wrong.

I have Python 2.7.8/Anaconda 2.0.1

Thanks,

JBB
===== Test code

import numpy as np
from matplotlib.pylab import *
import time as time

# Create a 3D array of "frames"
A = np.random.rand(5,5,10)

#Turn on interactive mode
ion()
# Turn off interactive mode
# ioff()

# Attempt to show each frame with a short delay between frames
for k in range(10):
     matshow(A[:,:,k])
     show()
     time.sleep(1)
     close()