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  • shoyer · 2 ✖

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  • Support for basic math (multiplication, difference) on two xarray-Datasets · 2 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
321599609 https://github.com/pydata/xarray/issues/1506#issuecomment-321599609 https://api.github.com/repos/pydata/xarray/issues/1506 MDEyOklzc3VlQ29tbWVudDMyMTU5OTYwOQ== shoyer 1217238 2017-08-10T16:14:30Z 2017-08-10T16:14:30Z MEMBER

A first check of your theory (shoyer) reveals that if the time stamps are exectly the same, i.e. the date and the time is equal for each time step in the two netcdf-files, then the operation is working sucessfully.

Glad that worked!

I only have to find a way to harmonize both datasets for time values prior operations with xarray ( a hard task considering model and evaluation data).

We have a few tools that might be useful here: - Resampling: http://xarray.pydata.org/en/stable/time-series.html#resampling-and-grouped-operations - Nearest neighbor lookups with reindex: http://xarray.pydata.org/en/stable/indexing.html#nearest-neighbor-lookups

 
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   Support for basic math (multiplication, difference) on two xarray-Datasets 249188875
321417223 https://github.com/pydata/xarray/issues/1506#issuecomment-321417223 https://api.github.com/repos/pydata/xarray/issues/1506 MDEyOklzc3VlQ29tbWVudDMyMTQxNzIyMw== shoyer 1217238 2017-08-10T00:28:42Z 2017-08-10T00:28:42Z MEMBER

Elementwise operations are supported between datasets, but only on aligned coordinates. In this case, it looks like there is no overlap for the "time" labels on each dataset -- maybe the dates are the same but the times differ slightly?

 
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   Support for basic math (multiplication, difference) on two xarray-Datasets 249188875

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