html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/460#issuecomment-129040941,https://api.github.com/repos/pydata/xarray/issues/460,129040941,MDEyOklzc3VlQ29tbWVudDEyOTA0MDk0MQ==,2443309,2015-08-08T19:48:46Z,2015-08-08T19:48:46Z,MEMBER,"Is this still something that would be useful?  If so, do we want a method on the `DataArray` object to get this sort of behavior:

``` python
In [1]: import xray
In [2]: import numpy as np
In [3]: da = xray.DataArray(np.random.random_sample(size=(5, 4)))

In [4]: da.where(da < 0.5)
Out[4]: 
<xray.DataArray (dim_0: 5, dim_1: 4)>
array([[ 0.127,    nan,  0.26 ,    nan],
       [ 0.377,  0.336,  0.451,    nan],
       [ 0.123,    nan,  0.373,  0.448],
       [ 0.129,    nan,    nan,  0.352],
       [ 0.229,    nan,    nan,  0.138]])
Coordinates:
  * dim_0    (dim_0) int64 0 1 2 3 4
  * dim_1    (dim_1) int64 0 1 2 3

In [5]: da.where(da < 0.5).to_masked_array()
Out[5]: 
masked_array(data =
 [[0.12696983303810094 -- 0.26047600586578334 --]
 [0.37674971618967135 0.33622174433445307 0.45137647047539964 --]
 [0.12310214428849964 -- 0.37301222522143085 0.4479968246859435]
 [0.12944067971751294 -- -- 0.35205353914802473]
 [0.2288873043216132 -- -- 0.1375535565632705]],
             mask =
 [[False  True False  True]
 [False False False  True]
 [False  True False False]
 [False  True  True False]
 [False  True  True False]],
       fill_value = 1e+20)
```

Alternatively, we could add a `@property` to the `DataArray` but I don't think that is necessary.  
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