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  • cumulative_integrate() method · 6 ✖

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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
830686509 https://github.com/pydata/xarray/pull/5153#issuecomment-830686509 https://api.github.com/repos/pydata/xarray/issues/5153 MDEyOklzc3VlQ29tbWVudDgzMDY4NjUwOQ== max-sixty 5635139 2021-05-01T20:01:27Z 2021-05-01T20:01:27Z MEMBER

Thanks a lot @johnomotani !

 
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   cumulative_integrate() method 857378504
826263265 https://github.com/pydata/xarray/pull/5153#issuecomment-826263265 https://api.github.com/repos/pydata/xarray/issues/5153 MDEyOklzc3VlQ29tbWVudDgyNjI2MzI2NQ== shoyer 1217238 2021-04-25T05:57:29Z 2021-04-25T05:57:29Z MEMBER

This is definitely welcome functionality! My only question is whether it should be a flag in the existing integrate method or a new method altogether, e.g., cumulative_integrate?

I would lean towards a new method because the function signature is different (not removing a dimension).

 
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   cumulative_integrate() method 857378504
826144780 https://github.com/pydata/xarray/pull/5153#issuecomment-826144780 https://api.github.com/repos/pydata/xarray/issues/5153 MDEyOklzc3VlQ29tbWVudDgyNjE0NDc4MA== max-sixty 5635139 2021-04-24T19:51:42Z 2021-04-24T19:51:42Z MEMBER

Great — shall we merge?

 
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   cumulative_integrate() method 857378504
821328415 https://github.com/pydata/xarray/pull/5153#issuecomment-821328415 https://api.github.com/repos/pydata/xarray/issues/5153 MDEyOklzc3VlQ29tbWVudDgyMTMyODQxNQ== max-sixty 5635139 2021-04-16T17:31:55Z 2021-04-16T17:31:55Z MEMBER

If we had a .expanding method (we only have .rolling at the moment), then I guess this could be .expanding(dim).integrate(). Is that right?

(but given we don't yet, no need to delay this)

 
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   cumulative_integrate() method 857378504
819140566 https://github.com/pydata/xarray/pull/5153#issuecomment-819140566 https://api.github.com/repos/pydata/xarray/issues/5153 MDEyOklzc3VlQ29tbWVudDgxOTE0MDU2Ng== fujiisoup 6815844 2021-04-14T00:41:20Z 2021-04-14T00:41:20Z MEMBER

There's a cumtrapz in https://github.com/fujiisoup/xr-scipy/blob/master/xrscipy/integrate.py. Does that help?

Now most of xr-scipy functionalities are already implemented in xarray and also I couldn't take time to maintain this package.

I think basic functionalities would be better to be integrated into xarray itself and cumulative_trapezoid would be a good candidate, as integrate is already there.

The implementation looks good to me. I didn't find any edge cases where duck_array_ops.cumulative_trapezoid behaves differently from scipy.integrate.cumtrapz.

 
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   cumulative_integrate() method 857378504
819107548 https://github.com/pydata/xarray/pull/5153#issuecomment-819107548 https://api.github.com/repos/pydata/xarray/issues/5153 MDEyOklzc3VlQ29tbWVudDgxOTEwNzU0OA== dcherian 2448579 2021-04-13T23:06:11Z 2021-04-13T23:06:11Z MEMBER 
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   cumulative_integrate() method 857378504

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