On Monday 22 September 2008 19:25:16 Tony S Yu wrote:

>  >>> import numpy as np
>  >>>
>  >>> color = np.array([(1, 2, 3), (4, 5, 6)],
>
> ...                  dtype=[('r', '<f4'), ('g', '<f4'), ('b', '<f4')])
> # get the average (grayscale) of the first row
>
>  >>> color[0].mean()

What about
color.view((float,3))[0].mean() ?

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