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How do I take from other dimensions? #740

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mrocklin opened this issue Sep 13, 2016 · 1 comment

mrocklin commented Sep 13, 2016

In NumPy I do this:

In [1]: import numpy as np

In [2]: x = np.arange(9).reshape((3, 3))

In [3]: x
Out[3]: 
array([[0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]])

In [4]: ind = np.array([True, False, True])

In [5]: x[ind, :]
Out[5]: 
array([[0, 1, 2],
       [6, 7, 8]])

In [6]: x[:, ind]
Out[6]: 
array([[0, 2],
       [3, 5],
       [6, 8]])

In DyND-python I can get partway there

In [7]: from dynd import nd

In [8]: x = nd.array(x)

In [9]: x
Out[9]: 
nd.array([[0, 1, 2], [3, 4, 5], [6, 7, 8]],
         type="3 * 3 * int64")

In [10]: ind = nd.array(ind)

In [11]: nd.take(x, ind)
Out[11]: 
nd.array([[0, 1, 2], [6, 7, 8]],
         type="var * 3 * int64")

But don't know how to proceed to take along the other dimension.

Member

insertinterestingnamehere commented Sep 19, 2016

@izaid any comments here?

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