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  • sel along 1D non-index coordinates · 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
1146877063 https://github.com/pydata/xarray/pull/3925#issuecomment-1146877063 https://api.github.com/repos/pydata/xarray/issues/3925 IC_kwDOAMm_X85EW_SH ivanakcheurov 5347026 2022-06-05T20:18:26Z 2022-06-05T20:18:26Z NONE

In #5692 it is possible to perform selection using non-dimension coordinates with an index, although there's no easy way yet to set an index for such coordinates (this will be done in a follow-up PR by updating the API of set_index).

@benbovy, please could you give an example how it is possible? I would like sel based on a non-dim coordinate to be as fast as sel based on the dim itself as per the following timings: ```python

sel based on a non-dim coordinate

(using this coordinate directly .sel(product_id=26) would result in error "'no index found for coordinate product_id")

%timeit xds.sel(product=xds.product_id==26) 1.54 ms ± 64.2 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

sel based on the dim itself

%timeit xds.sel(product='GN91 Glove Medium') 499 µs ± 16.1 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

%timeit xds.where(xds.product_id==26, drop=True) 4.17 ms ± 39 µs per loop (mean ± std. dev. of 7 runs, 100 loops each) ```

 
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   sel along 1D non-index coordinates 592312709
607584705 https://github.com/pydata/xarray/pull/3925#issuecomment-607584705 https://api.github.com/repos/pydata/xarray/issues/3925 MDEyOklzc3VlQ29tbWVudDYwNzU4NDcwNQ== pep8speaks 24736507 2020-04-02T02:24:04Z 2020-04-02T02:24:04Z NONE

Hello @TomNicholas! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

Line 219:12: E131 continuation line unaligned for hanging indent Line 220:14: E131 continuation line unaligned for hanging indent Line 223:10: E111 indentation is not a multiple of four Line 223:10: E117 over-indented

 
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   sel along 1D non-index coordinates 592312709

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