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  • Dropping values along multidimensions · 2 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
499787057 https://github.com/pydata/xarray/issues/2834#issuecomment-499787057 https://api.github.com/repos/pydata/xarray/issues/2834 MDEyOklzc3VlQ29tbWVudDQ5OTc4NzA1Nw== maxdow 711050 2019-06-07T07:30:39Z 2019-06-07T07:30:39Z NONE

Thank you for your message. This is what I finally do :) 

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   Dropping values along multidimensions 423632904
499285779 https://github.com/pydata/xarray/issues/2834#issuecomment-499285779 https://api.github.com/repos/pydata/xarray/issues/2834 MDEyOklzc3VlQ29tbWVudDQ5OTI4NTc3OQ== 0x0L 3621629 2019-06-05T22:56:00Z 2019-06-05T22:58:18Z CONTRIBUTOR

Hello @maxdow

I'm not sure I understand your issue correctly. If all you want is to keep only the points time, lat, lon for which t and/or dd is not NA you can simply use ```python z = d.stack(index=d.dims).dropna('index', how='all')

<xarray.Dataset> Dimensions: (index: 346) Coordinates: * index (index) MultiIndex - time (index) datetime64[ns] 2019-03-09 2019-03-09 ... 2019-03-09 - lat (index) float64 43.5 43.5 43.5 43.75 43.75 ... 45.0 45.0 45.5 45.5 - lon (index) float64 1.25 1.5 4.25 1.75 2.25 ... 1.75 2.0 4.0 1.5 2.0 Data variables: t (index) float64 0.6184 0.2966 1.426 0.8666 ... 0.09348 1.271 1.353 dd (index) float64 2.075 1.174 0.906 0.6451 ... 0.3491 0.1789 0.8922 You still have access to the coordinates of the valid points through `z.time`, `z.lat` and `z.lon`:python z.lat

<xarray.DataArray 'lat' (index: 346)> array([43.5 , 43.5 , 43.5 , ..., 51.25, 51.25, 51.25]) Coordinates: * index (index) MultiIndex - time (index) datetime64[ns] 2019-03-09 2019-03-09 ... 2019-03-09 - lat (index) float64 43.5 43.5 43.5 43.75 43.75 ... 45.0 45.0 45.5 45.5 - lon (index) float64 1.25 1.5 4.25 1.75 2.25 ... 1.75 2.0 4.0 1.5 2.0 ```

One can still unstack this and achieve the equivalent of multi-dimensional dropna. However in your example all the coordinates for time look equal (they shouldn't be) and this will prevent unstacking.

I hope this helps

 
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   Dropping values along multidimensions 423632904

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