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  • pd.Period can't be used as a 1-element coord · 5 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
269059020 https://github.com/pydata/xarray/issues/805#issuecomment-269059020 https://api.github.com/repos/pydata/xarray/issues/805 MDEyOklzc3VlQ29tbWVudDI2OTA1OTAyMA== shoyer 1217238 2016-12-24T00:09:47Z 2016-12-24T00:09:47Z MEMBER

Yep, looks like this works now. There's no period dtype in NumPy, so object dtype is the best we can do.

 
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   pd.Period can't be used as a 1-element coord 143764621
269031217 https://github.com/pydata/xarray/issues/805#issuecomment-269031217 https://api.github.com/repos/pydata/xarray/issues/805 MDEyOklzc3VlQ29tbWVudDI2OTAzMTIxNw== max-sixty 5635139 2016-12-23T18:51:10Z 2016-12-23T18:51:10Z MEMBER

This now works, although as an object array rather than PI. Which is probably OK:

```python In [6]: ds Out[6]: <xarray.Dataset> Dimensions: (time: 3, x: 2, y: 2) Coordinates: lon (x, y) float64 -99.83 -99.32 -99.79 -99.23 lat (x, y) float64 42.25 42.21 42.63 42.59 * time (time) datetime64[ns] 2014-09-06 2014-09-07 2014-09-08 reference_time object 2014 * x (x) int64 0 1 * y (y) int64 0 1 Data variables: temperature (x, y, time) float64 12.29 8.305 10.63 16.6 2.823 16.29 ... precipitation (x, y, time) float64 4.541 3.618 3.336 2.332 7.987 4.197 ...

In [7]: ds.reference_time Out[7]: <xarray.DataArray 'reference_time' ()> array(Period('2014', 'A-DEC'), dtype=object) Coordinates: reference_time object 2014 ```

@shoyer - to close?

 
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   pd.Period can't be used as a 1-element coord 143764621
202469160 https://github.com/pydata/xarray/issues/805#issuecomment-202469160 https://api.github.com/repos/pydata/xarray/issues/805 MDEyOklzc3VlQ29tbWVudDIwMjQ2OTE2MA== khaeru 1634164 2016-03-28T16:19:05Z 2016-03-28T16:19:05Z NONE

@jhamman — you're right. In truth, I was working with some more complex code using a PeriodIndex and getting errors I couldn't decipher, so I pulled those lines from the docs and played with them to try to understand what was happening. I don't know why it's that way in the docs…maybe because ds['reference_time'] or ds.reference_time is more concise than ds.attrs['reference_time']?

@shoyer — thanks!

 
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   pd.Period can't be used as a 1-element coord 143764621
202199581 https://github.com/pydata/xarray/issues/805#issuecomment-202199581 https://api.github.com/repos/pydata/xarray/issues/805 MDEyOklzc3VlQ29tbWVudDIwMjE5OTU4MQ== shoyer 1217238 2016-03-28T02:36:54Z 2016-03-28T02:36:54Z MEMBER

Thanks for the bug report -- this should definitely work. I'll take a look.

 
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   pd.Period can't be used as a 1-element coord 143764621
201992240 https://github.com/pydata/xarray/issues/805#issuecomment-201992240 https://api.github.com/repos/pydata/xarray/issues/805 MDEyOklzc3VlQ29tbWVudDIwMTk5MjI0MA== jhamman 2443309 2016-03-27T05:00:49Z 2016-03-27T05:00:49Z MEMBER

It doesn't really seem like reference_time is a "coordinate" variable. Being a scalar, you are not going to use it as a coordinate in the same sense as lat/lon/time. Nevertheless, your example works if you cast the Period to a DataArray first:

Python ds = xr.Dataset({'temperature': (['x', 'y', 'time'], temp), 'precipitation': (['x', 'y', 'time'], precip)}, coords={'lon': (['x', 'y'], lon), 'lat': (['x', 'y'], lat), 'time': pd.date_range('2014-09-06', periods=3), 'reference_time': xr.DataArray(pd.Period('2014'))})

 
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   pd.Period can't be used as a 1-element coord 143764621

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