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  • keewis · 2 ✖

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  • dataarray arithmetics restore removed coordinates in xarray 0.15 · 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
581914938 https://github.com/pydata/xarray/issues/3746#issuecomment-581914938 https://api.github.com/repos/pydata/xarray/issues/3746 MDEyOklzc3VlQ29tbWVudDU4MTkxNDkzOA== keewis 14808389 2020-02-04T13:42:41Z 2020-02-04T14:31:23Z MEMBER

the issue here is that if you call __delitem__ on DataArray.coords (which returns a dict-like object named DataArrayCoordinates), it deletes the coordinates, but leaves the indexes intact: python In [13]: arr1_ = arr1.copy() ...: del arr1_.coords["x"] ...: del arr1_.coords["y"] ...: arr1_.coords, arr1_.indexes Out[13]: (Coordinates: *empty*, y: Int64Index([0, 1], dtype='int64', name='y') x: Int64Index([0, 1], dtype='int64', name='x'))

Since #3481 the indexes are passed along in binary operations (such as multiplication) and will thus cause the coordinates reappear. Note that coordinates without indexes (non-dimension coordinates) will be removed properly.

If we want to support this way of dropping coordinates we should update the indexes, explicitly or via drop_vars, otherwise we might want to make *Coordinates objects read-only.

For now the easiest way to properly remove coordinates is by using drop_vars.

 
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   dataarray arithmetics restore removed coordinates in xarray 0.15 559645981
581936376 https://github.com/pydata/xarray/issues/3746#issuecomment-581936376 https://api.github.com/repos/pydata/xarray/issues/3746 MDEyOklzc3VlQ29tbWVudDU4MTkzNjM3Ng== keewis 14808389 2020-02-04T14:30:41Z 2020-02-04T14:30:41Z MEMBER

I don't know whether or not this was supposed to work. Since there is a explicit __delitem__, I'd say it was at some point and my question above is more along the lines of "should this still work?".

 
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   dataarray arithmetics restore removed coordinates in xarray 0.15 559645981

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