[Matplotlib-users] colorbar uncentered plots

[Philip V. <pv+...@ma...>]

Hello! see below for sample code.

(1) I find that the second subplot is shifted to the right.
This seems to happen generally with colorbar. How do I fix it?

(2) is there a way to clear/remove selected parts of the figure?
I am using ipython for interactive figure drawing
I find clf() will erase everything, cla() will empty the square plot,
   but I can't see how to clear the first subfigure or the colorbar.
This would be useful as any changes to the colorbar create a new one.
(uncomment the second cbar line to see this)

(3) is it possible to modify the orientation of cbar once drawn?
cbar.orientation ='horizontal'
plt.draw()
plt.show()
leaves it unchanged.

Thank you for your help!

================ Here is my code: ==================

#!/usr/bin/env python
import matplotlib.pyplot as plt
import numpy as np
from time import sleep
x = np.arange(0, 10, 0.2)
y = np.sin(x)
fig = plt.figure()
ax1 = fig.add_subplot(211)
cax1 = ax1.plot(x, y)
ax2 = fig.add_subplot(212)
A = np.random.random_integers(0, 10, 100).reshape(10, 10)
cax2 = ax2.imshow(A, interpolation="nearest",vmin=-1,vmax=11 )
cbar = fig.colorbar(cax2)
#cbar = fig.colorbar(cax2, ticks=[0, 5, 10])
plt.savefig('colorbartest.pdf')

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