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  • scottstanie · 1 ✖

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  • `polyfit` with weights alters the DataArray in place · 1 ✖

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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
888522258 https://github.com/pydata/xarray/issues/5644#issuecomment-888522258 https://api.github.com/repos/pydata/xarray/issues/5644 IC_kwDOAMm_X8409cYS scottstanie 8291800 2021-07-28T18:20:49Z 2021-07-28T18:20:49Z CONTRIBUTOR

As a temporary workout for my case, I'm just going to do

python In [3]: pf = (da.copy(True)).polyfit("z", deg=2, w=np.arange(nz)) In [5]: da.max(), da.mean() Out[5]: (<xarray.DataArray ()> array(0.99878237), <xarray.DataArray ()> array(0.50869358))

The thing I don't understand is that _to_temp_dataset seems to be trying to do a deep copy (based on the argument names)

https://github.com/pydata/xarray/blob/da99a5664df4f5013c2f6b0e758394bec5e0bc80/xarray/core/dataarray.py#L490-L491

But it is acting like a shallow copy:

python In [6]: pf = (da.copy(False)).polyfit("z", deg=2, w=np.arange(nz)) In [7]: da.max(), da.mean() Out[7]: (<xarray.DataArray ()> array(8.92217147), <xarray.DataArray ()> array(2.29014397))

 
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   `polyfit` with weights alters the DataArray in place 955043280

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