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  • Lost coords after multiplication · 4 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
482225459 https://github.com/pydata/xarray/issues/1403#issuecomment-482225459 https://api.github.com/repos/pydata/xarray/issues/1403 MDEyOklzc3VlQ29tbWVudDQ4MjIyNTQ1OQ== shoyer 1217238 2019-04-11T17:53:15Z 2019-04-11T17:53:15Z MEMBER

Closing this in favor of the bigger discussion in https://github.com/pydata/xarray/issues/2217

 
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   Lost coords after multiplication 227858207
482188305 https://github.com/pydata/xarray/issues/1403#issuecomment-482188305 https://api.github.com/repos/pydata/xarray/issues/1403 MDEyOklzc3VlQ29tbWVudDQ4MjE4ODMwNQ== stale[bot] 26384082 2019-04-11T16:31:50Z 2019-04-11T16:31:50Z NONE

In order to maintain a list of currently relevant issues, we mark issues as stale after a period of inactivity

If this issue remains relevant, please comment here or remove the stale label; otherwise it will be marked as closed automatically

 
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   Lost coords after multiplication 227858207
300841058 https://github.com/pydata/xarray/issues/1403#issuecomment-300841058 https://api.github.com/repos/pydata/xarray/issues/1403 MDEyOklzc3VlQ29tbWVudDMwMDg0MTA1OA== Yefee 6420873 2017-05-11T16:18:35Z 2017-05-11T16:18:35Z NONE

Thanks, @shoyer. This confuses me for a long time. It solves my problem to some extent.

 
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   Lost coords after multiplication 227858207
300834776 https://github.com/pydata/xarray/issues/1403#issuecomment-300834776 https://api.github.com/repos/pydata/xarray/issues/1403 MDEyOklzc3VlQ29tbWVudDMwMDgzNDc3Ng== shoyer 1217238 2017-05-11T15:56:32Z 2017-05-11T15:56:32Z MEMBER

The problem here is that your coordinates differ slightly on each file: In [14]: abs(advt.TLAT - tarea.TLAT).max() Out[14]: <xarray.DataArray 'TLAT' ()> array(4.547473508864641e-13)

This does come up with some frequency, but unfortunately, it's hard to know a priori whether differences in floating point values are meaningful or just due to loss of numerical precision.

One way to fix this would be to add a tolerance keyword argument of some sort to xarray.Variable.equals(), which we could allow setting via xarray.set_options() for arithmetic. Then you could write something like: with xarray.set_options(float_tolerance=1e-8): result = advt * tarea and still preserve coordinates.

 
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   Lost coords after multiplication 227858207

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