Minor fix for simpler indexing syntax in array of subplots.
`plt.subplots()` returns a numpy array, so it's OK to use the more compact/familiar/efficient `a[i,j]` indexing syntax instead of `a[i][j]`.

Good catch, I indeed thought it returned a list of lists but an ndarray makes more sense 
 On Sun, Dec 4, 2011 at 6:39 PM, Wes McKinney
reply@reply.github.com
wrote:

> Good catch, I indeed thought it returned a list of lists but an ndarray makes more sense

Thanks for the quick merge.  Loving pandas :)
