[Numpy-discussion] indexing question

Ernest Adrogué eadrogue@gmx....
Sun Nov 21 13:15:00 CST 2010


Hi,

Suppose an array of shape (N,2,2), that is N arrays of
shape (2,2). I want to select an element (x,y) from each one
of the subarrays, so I get a 1-dimensional array of length
N. For instance:

In [228]: t=np.arange(8).reshape(2,2,2)

In [229]: t
Out[229]: 
array([[[0, 1],
        [2, 3]],

       [[4, 5],
        [6, 7]]])

In [230]: x=[0,1]

In [231]: y=[1,1]

In [232]: t[[0,1],x,y]
Out[232]: array([1, 7])

This way, I get the elements (0,1) and (1,1) which is what
I wanted. The question is: is it possible to omit the [0,1]
in the index?

Thanks in advance.

-- 
Ernest


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