issue_comments: 126771341

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https://github.com/pydata/xarray/pull/504#issuecomment-126771341 https://api.github.com/repos/pydata/xarray/issues/504 126771341 MDEyOklzc3VlQ29tbWVudDEyNjc3MTM0MQ== 5356122 2015-07-31T17:57:01Z 2015-07-31T17:57:01Z MEMBER

Here's something related that one can do in Numpy- replace all negative entries with 0.

``` In [15]: a = np.arange(-5, 5).reshape(2, 5)

In [16]: a Out[16]: array([[-5, -4, -3, -2, -1], [ 0, 1, 2, 3, 4]])

In [17]: a[a < 0] = 0

In [18]: a Out[18]: array([[0, 0, 0, 0, 0], [0, 1, 2, 3, 4]]) ```

Would it be possible to modify __getitem__ for this common use case?

 
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