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  • xarray · 2 ✖
id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
98274024 MDExOlB1bGxSZXF1ZXN0NDEyODY3ODI= 504 ENH: where method for masking xray objects according to some criteria shoyer 1217238 closed 0     12 2015-07-30T21:56:00Z 2015-08-01T20:56:33Z 2015-08-01T20:56:31Z MEMBER   0 pydata/xarray/pulls/504

Fixes #503

Example usage:

``` In [13]: x = xray.DataArray(np.arange(9).reshape(3, 3), dims=['x', 'y'])

In [14]: x.where(x > 4) Out[14]: <xray.DataArray (x: 3, y: 3)> array([[ nan, nan, nan], [ nan, nan, 5.], [ 6., 7., 8.]]) Coordinates: * y (y) int64 0 1 2 * x (x) int64 0 1 2 ```

Example from "What's new":

``` In [4]: ds = xray.Dataset(coords={'x': range(100), 'y': range(100)})

In [5]: ds['distance'] = np.sqrt(ds.x ** 2 + ds.y ** 2)

In [6]: ds.distance.where(ds.distance < 100).plot() Out[6]: <matplotlib.image.AxesImage at 0x11a819690> ```

 
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     xarray 13221727 pull
98250388 MDU6SXNzdWU5ODI1MDM4OA== 503 Add "where" method copied from pandas shoyer 1217238 closed 0     0 2015-07-30T19:57:26Z 2015-08-01T20:56:31Z 2015-08-01T20:56:31Z MEMBER      

Instead of writing: (ds * (ds > 7)).sum() / (ds > 7).sum()

It would be nice to be able to write: ds.where(ds > 7).mean()

For more examples, see: http://pandas.pydata.org/pandas-docs/stable/indexing.html#the-where-method-and-masking

This came up on the mailing list recently: https://groups.google.com/forum/#!topic/xray-dev/mEo88uGl8g8

 
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   completed xarray 13221727 issue

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