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  • Adding new DataArray to a Dataset removes attrs of existing coord · 3 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
690551774 https://github.com/pydata/xarray/issues/4415#issuecomment-690551774 https://api.github.com/repos/pydata/xarray/issues/4415 MDEyOklzc3VlQ29tbWVudDY5MDU1MTc3NA== dcherian 2448579 2020-09-10T17:38:08Z 2020-09-10T17:38:08Z MEMBER

See https://github.com/pydata/xarray/issues/4393 and https://github.com/pydata/xarray/issues/2180#issuecomment-391932929 there. It's confusing but I don't know what a good solution is. Let's keep further discussion to #2180

 
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   Adding new DataArray to a Dataset removes attrs of existing coord 698263021
690538286 https://github.com/pydata/xarray/issues/4415#issuecomment-690538286 https://api.github.com/repos/pydata/xarray/issues/4415 MDEyOklzc3VlQ29tbWVudDY5MDUzODI4Ng== johnomotani 3958036 2020-09-10T17:29:28Z 2020-09-10T17:29:28Z CONTRIBUTOR

Apparently it's possible to work around this by using merge() instead of assigning. The following produces the expected output: ``` import numpy as np import xarray as xr

ds = xr.Dataset() ds["a"] = xr.DataArray(np.linspace(0., 1.), dims="x")

ds["x"] = xr.DataArray(np.linspace(0., 2., len(ds["x"])), dims="x") ds["x"].attrs["foo"] = "bar"

print(ds["x"])

ds["b"] = xr.DataArray(np.linspace(0., 1.), dims="x")

ds = ds.merge(xr.DataArray(np.linspace(0., 1.), dims="x", name="b"))

print(ds["x"]) ```

 
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   Adding new DataArray to a Dataset removes attrs of existing coord 698263021
690535154 https://github.com/pydata/xarray/issues/4415#issuecomment-690535154 https://api.github.com/repos/pydata/xarray/issues/4415 MDEyOklzc3VlQ29tbWVudDY5MDUzNTE1NA== johnomotani 3958036 2020-09-10T17:24:06Z 2020-09-10T17:24:06Z CONTRIBUTOR

Unfortunately I don't have time at the moment to dig into why this is happening, but it was confusing because I found a bug where attrs had disappeared, and eventually chased it down to where some new variables were added to my Dataset, which I would not expect to change existing coordinates!

 
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   Adding new DataArray to a Dataset removes attrs of existing coord 698263021

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