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  • bcbnz · 2 ✖

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  • Fix behaviour of min_count in reducing functions · 2 ✖

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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
779750462 https://github.com/pydata/xarray/pull/4911#issuecomment-779750462 https://api.github.com/repos/pydata/xarray/issues/4911 MDEyOklzc3VlQ29tbWVudDc3OTc1MDQ2Mg== bcbnz 367900 2021-02-16T10:40:28Z 2021-02-16T10:40:28Z CONTRIBUTOR

Not for this PR but I wonder if xr.DataArray([1]).sum(min_count=2) should actually return NA.

It would make it more consistent, the current behaviour is

  • xr.DataArray([1]).sum(min_count=2) -> 1
  • xr.DataArray([1.0]).sum(min_count=2) -> nan

due to the different dtype defaults for skipna. I guess this would require rework of the dispatch logic in xarray.core.duck_array_ops._create_nan_agg_method to make it call nansum/nanprod when appropriate (e.g., should setting min_count imply skipna=True?).

 
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   Fix behaviour of min_count in reducing functions 808558647
779709464 https://github.com/pydata/xarray/pull/4911#issuecomment-779709464 https://api.github.com/repos/pydata/xarray/issues/4911 MDEyOklzc3VlQ29tbWVudDc3OTcwOTQ2NA== bcbnz 367900 2021-02-16T09:36:32Z 2021-02-16T09:36:32Z CONTRIBUTOR
  • Changed to use duck_array_ops.where
  • Docstring updated and entry added to breaking changes of whats new (I assumed this was appropriate). Note its a bit more nuanced than @mathause stated: for an integer array, skipna defaults to False and so xarray.core.duck_array_ops._create_nan_agg_method does not call nansum. This means you have to force skipna=True to see the difference:
    • master: xr.DataArray([1]).sum(min_count=1).dtype -> int64
    • this PR: xr.DataArray([1]).sum(min_count=1).dtype -> int64
    • master: xr.DataArray([1]).sum(skipna=True, min_count=1).dtype -> int64
    • this PR: xr.DataArray([1]).sum(skipna=True, min_count=1).dtype -> float64

Hopefully this is clear in the docstring changes, suggestions welcome.

 
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   Fix behaviour of min_count in reducing functions 808558647

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