[Numpy-discussion] filtering rows from a numpy.ndarray

[Jan Wuyts]

I've read in a datafile to an ndarray with this command:

   data=np.genfromtxt('n.txt', delimiter='\t', dtype=[('paramname','S26'),
('study','S26'), ('class','S10'), ('count','f4'), ('average','f4'),
('sd','f4'))


I would like to filter the array to only rows where paramname == 'bmi'. What
would be the most elegant way of doing this? I found 1 way for doing this
but it doesn't look very efficient nor elegant.


   bmidata=np.asarray([x for x in data if x['paramname']=='bmi'],
dtype=data.dtype)


any simpler ways?


Thanks,


Jan.
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