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  • maboualidev · 3 ✖

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  • Implement polyfit? · 3 ✖

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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
566132726 https://github.com/pydata/xarray/issues/3349#issuecomment-566132726 https://api.github.com/repos/pydata/xarray/issues/3349 MDEyOklzc3VlQ29tbWVudDU2NjEzMjcyNg== maboualidev 24830983 2019-12-16T16:21:18Z 2019-12-16T16:21:18Z NONE

@maboualidev Is your objective to integrate the GeoCat implementation into xarray or keep it standalone ?

GeoCAT is the python version of NCL and we are a team at NCAR working on it. I know that the team decision is to make use of Xarray within GeoCAT as much as possible, though. 

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   Implement polyfit? 499477363
565738511 https://github.com/pydata/xarray/issues/3349#issuecomment-565738511 https://api.github.com/repos/pydata/xarray/issues/3349 MDEyOklzc3VlQ29tbWVudDU2NTczODUxMQ== maboualidev 24830983 2019-12-14T17:58:34Z 2019-12-14T18:00:08Z NONE

Hi @huard Thanks for the reply.

Regarding:

There does not seem to be matching polyval implementations for any of those nor support for indexing along a time dimension with a non-standard calendar.

There is a pull request on GeoCAT-comp for ndpolyval. I think polyval and polyfit go hand-in-hand. If we have ndpolyfit there must be a also a ndpolyval.

Regarding:

I see you're storing the residuals in the DataArray attributes. From my perspective, it would be useful to have those directly as DataArrays. Thoughts ?

I see the point and agree with you. I think it is a good idea to be as similar to NumPy.polyfit as possible; even for the style of the output. I will see it through to have that changed in GeoCAT.

attn: @clyne and @khallock

 
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   Implement polyfit? 499477363
565675452 https://github.com/pydata/xarray/issues/3349#issuecomment-565675452 https://api.github.com/repos/pydata/xarray/issues/3349 MDEyOklzc3VlQ29tbWVudDU2NTY3NTQ1Mg== maboualidev 24830983 2019-12-14T03:01:44Z 2019-12-14T03:03:14Z NONE

geocat.comp.ndpolyfit extends NumPy.polyfit for multi-dimensional arrays and has support for Xarray and Dask. It does exactly what is requested here.

regards,

@andersy005 @clyne @matt-long @khallock

 
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   Implement polyfit? 499477363

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