[pymvpa] how to create a histogram for the searchlight results?

[Glen Lee]

 Hello,
 I'm going over the tutorial and I'd like to create a histogram for the
exercise (e.g., hist(sphere_errors, bins=np.linspace(0, 1, 18)).
 However, the python spits out the error saying "name 'hist' is not defined.

 Does anybody know what this happened? (I'm also new to the python
programming)

 Thanks,
 Glen
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