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  • A broadcasting sum for xarray.Dataset · 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
1178897408 https://github.com/pydata/xarray/issues/6053#issuecomment-1178897408 https://api.github.com/repos/pydata/xarray/issues/6053 IC_kwDOAMm_X85GRIwA mjwillson 4502 2022-07-08T11:49:23Z 2022-07-08T11:49:23Z NONE

Re xr.broadcast(ds)[0].sum(dims) -- Thanks, that's neat and may be useful as a workaround, but it looks like it could incur significant extra CPU and RAM costs (tiling all variables to the full size in memory before summing over the tiled values)? Or is there some clever optimisation under the hood which would avoid this?

I also only wanted it to (behave as though it) broadcast the dims that are summed over, but this looks like it will broadcast all dims including those not summed over?

Overall I think it'd be better to have an option on sum (like missing_dim='broadcast' as suggested in #6749), rather than documenting a partial workaround like this, given the caveats attached to the workaround and that (to me at least) the broadcasting sum is more in keeping with the usual mathematical semantics of 'sum' than what 'sum' currently does.

 
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   A broadcasting sum for xarray.Dataset 1074303184

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