[Numpy-discussion] ndarray with double comparison

Chao YUE chaoyuejoy@gmail....
Thu Oct 13 11:13:12 CDT 2011


Dear all,

sorry for this stupid question but I cannot find it in numpy tutorial or
google.
suppose I have a=np.arange(11).

In [32]: a < 8
Out[32]:
array([ True,  True,  True,  True,  True,  True,  True,  True, False,
       False, False], dtype=bool)

In [34]: a > 4
Out[34]:
array([False, False, False, False, False,  True,  True,  True,  True,
        True,  True], dtype=bool)

how can I have boolean index like 4 < a < 8
np.where(a>4 and a<8);or plainly input "a>4 and a<8" doesn't work.

thanks,

Chao

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Chao YUE
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