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  • maboualidev · 4 ✖

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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
567738254 https://github.com/pydata/xarray/issues/3641#issuecomment-567738254 https://api.github.com/repos/pydata/xarray/issues/3641 MDEyOklzc3VlQ29tbWVudDU2NzczODI1NA== maboualidev 24830983 2019-12-20T00:37:01Z 2019-12-20T00:44:45Z NONE

I wanted to bring attention to a package that we are working on that originally started with remapping time axis. The package is called AxisUtilities and is available at https://github.com/coderepocenter/AxisUtilities.

It doesn’t yet have any support for CFTime yet (well it does support it now; but you need to manually convert cftime to a number for now) But we are working on it (so that the cftime to number conversion is more automatic). We have the basis there. We are now working on it to make it easier to use and remove certain steps.

It follows the ESMF or SCRIP interpolation pattern, i.e. once you make the remapper object, you could use it for multiple data set as long as the source and destination axis has not changed.

 
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   interp with long cftime coordinates raises an error 539648897
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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