Claus,

f.colorbar may be trying to place the colorbar on the 'current axes'.  Does 
placing 
plt.axes(axarr[0,0])
before each f.colorbar help?  Also, the plt.colorbar function [1] (maybe 
f.colorbar also) can take a keyword argument for the axes in which to draw the 
colorbar.

-Sterling

[1] http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.colorbar


On Dec 13, 2012, at 7:45AM, Claus wrote:

> Hi,
> 
> I am trying to plot a colorbar next to each subplot in a figure. In the 
> following example, I create two figures. In the second figure, I try to add 
> the colorbars. Is there a way to show the colorbar next to each subplot. The 
> way I did it, all the colorbars appear next to the last subplot, take away 
> space from it, and all are plotted using the "jet" colormap.
> Unfortunately, I am not sure how to do this better, and would appreciate 
> hints.
> 
> 
> import numpy as np
> import matplotlib.pylab as plt
> 
> def main():
> 
>    # four subplots, no colorbar, so far so good
>    f, axarr = plt.subplots(2, 2)
>    axarr[0, 0].imshow(np.random.rand(5,5)*10)
>    axarr[0, 1].imshow(np.random.rand(5,5))
>    axarr[1, 0].imshow(np.random.rand(5,5)*100)
>    axarr[1, 1].imshow(np.random.rand(5,5)*1000)
>    plt.show()
> 
>    # four subplots, four colorbars
>    f, axarr = plt.subplots(2, 2)
>    a = axarr[0, 0].imshow(np.random.rand(5,5)*10)
>    cbar1 = f.colorbar(a, cmap='jet')
>    b = axarr[0, 1].imshow(np.random.rand(5,5))
>    cbar2 = f.colorbar(b, cmap='Reds')
>    c = axarr[1, 0].imshow(np.random.rand(5,5)*100)
>    cbar2 = f.colorbar(c, cmap='Blues')
>    d = axarr[1, 1].imshow(np.random.rand(5,5)*1000)
>    cbar2 = f.colorbar(d, cmap='Greens')
>    plt.show()
> 
> if __name__ == '__main__':
>    main()
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