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  • .sel(drop=True) fails to drop coordinate · 4 ✖
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314154076 https://github.com/pydata/xarray/issues/1472#issuecomment-314154076 https://api.github.com/repos/pydata/xarray/issues/1472 MDEyOklzc3VlQ29tbWVudDMxNDE1NDA3Ng== delgadom 3698640 2017-07-10T16:08:30Z 2017-07-10T16:08:30Z CONTRIBUTOR

I wasn't misled by the docs, just by my intuition. But now that you've made the distinction between '2012' and '2012-12-31' this totally makes sense:

```python In [24]: arr.sel(time='2012') Out[24]: <xarray.DataArray (time: 1, age: 4)> array([[ 0.244146, 0.702819, 0.06614 , 0.211758]]) Coordinates: * age (age) object 'age0' 'age1' 'age2' 'age3' * time (time) datetime64[ns] 2012-12-31

In [25]: arr.sel(time='2012-12-31') Out[25]: <xarray.DataArray (age: 4)> array([ 0.244146, 0.702819, 0.06614 , 0.211758]) Coordinates: * age (age) object 'age0' 'age1' 'age2' 'age3' time datetime64[ns] 2012-12-31

In [26]: arr.sel(time=np.datetime64('2012-12-31')) Out[26]: <xarray.DataArray (age: 4)> array([ 0.244146, 0.702819, 0.06614 , 0.211758]) Coordinates: * age (age) object 'age0' 'age1' 'age2' 'age3' time datetime64[ns] 2012-12-31 ```

 
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   .sel(drop=True) fails to drop coordinate 241389297
314149877 https://github.com/pydata/xarray/issues/1472#issuecomment-314149877 https://api.github.com/repos/pydata/xarray/issues/1472 MDEyOklzc3VlQ29tbWVudDMxNDE0OTg3Nw== shoyer 1217238 2017-07-10T15:54:22Z 2017-07-10T15:54:22Z MEMBER

If you can point to a place in docs where you were mislead, suggestions for clarification would be very welcome.

 
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   .sel(drop=True) fails to drop coordinate 241389297
314136206 https://github.com/pydata/xarray/issues/1472#issuecomment-314136206 https://api.github.com/repos/pydata/xarray/issues/1472 MDEyOklzc3VlQ29tbWVudDMxNDEzNjIwNg== delgadom 3698640 2017-07-10T15:10:50Z 2017-07-10T15:10:50Z CONTRIBUTOR

thanks for the schooling. learned something new!

 
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   .sel(drop=True) fails to drop coordinate 241389297
314007170 https://github.com/pydata/xarray/issues/1472#issuecomment-314007170 https://api.github.com/repos/pydata/xarray/issues/1472 MDEyOklzc3VlQ29tbWVudDMxNDAwNzE3MA== shoyer 1217238 2017-07-10T05:09:05Z 2017-07-10T05:09:05Z MEMBER

drop=True is actually intended to control dropping scalar coordinates, but the result of indexing with '2012' isn't producing a scalar. In this case, what you need is to squeeze out the length one dimension, with .squeeze().

The counter intuitive behavior you are seeing for indexing with a string for a year like arr.sel(time='2012') is something we inherit upstream from pandas: http://pandas.pydata.org/pandas-docs/stable/timeseries.html#slice-vs-exact-match

 
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   .sel(drop=True) fails to drop coordinate 241389297

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