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  • GroupBy.map with keep_attrs=True gives error · 3 ✖

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697507489 https://github.com/pydata/xarray/issues/4450#issuecomment-697507489 https://api.github.com/repos/pydata/xarray/issues/4450 MDEyOklzc3VlQ29tbWVudDY5NzUwNzQ4OQ== dcherian 2448579 2020-09-23T15:06:23Z 2020-09-23T15:06:23Z MEMBER

Yes.

Somewhat related: I'm always confused about whether ds.groupby(..., keep_attrs=True).mean() or ds.groupby(...).mean(keep_attrs=True) is correct. (similarly for rolling, coarsen etc.)

 
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   GroupBy.map with keep_attrs=True gives error 706568536
697325890 https://github.com/pydata/xarray/issues/4450#issuecomment-697325890 https://api.github.com/repos/pydata/xarray/issues/4450 MDEyOklzc3VlQ29tbWVudDY5NzMyNTg5MA== mathause 10194086 2020-09-23T12:17:51Z 2020-09-23T12:17:51Z MEMBER

Implementing keep_attrs as a kwarg to map and python with xr.set_options(keep_attrs=True): test_map = ds.groupby('lat').map(np.mean) not working for coordinate variables are two different issues, right?

 
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   GroupBy.map with keep_attrs=True gives error 706568536
696907513 https://github.com/pydata/xarray/issues/4450#issuecomment-696907513 https://api.github.com/repos/pydata/xarray/issues/4450 MDEyOklzc3VlQ29tbWVudDY5NjkwNzUxMw== dcherian 2448579 2020-09-22T18:41:13Z 2020-09-22T18:42:37Z MEMBER

That code passes keep_attrs to np.mean so it won't work. we should add keep_attrs as a kwarg to map

you'll have to do it like this import numpy as np import xarray as xr ds = xr.tutorial.open_dataset("air_temperature") with xr.set_options(keep_attrs=True): test_map = ds.groupby('lat').map(np.mean) test_map.lat

but it doesn't work for the coordinate variables. We'll have to fix it. Right now, you'll have to propagate attrs manually

 
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   GroupBy.map with keep_attrs=True gives error 706568536

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