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  • stanwest · 1 ✖

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  • Plotting in 2D with one non-dimension coordinate given behaves contrary to documentation and can cause cryptic ValueError · 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
747621248 https://github.com/pydata/xarray/issues/4702#issuecomment-747621248 https://api.github.com/repos/pydata/xarray/issues/4702 MDEyOklzc3VlQ29tbWVudDc0NzYyMTI0OA== stanwest 38358698 2020-12-17T18:35:13Z 2020-12-17T18:35:13Z CONTRIBUTOR

Note that da.plot(x="lon", y="lat") and da.plot(x="lon", y="v") both work. So you have at least a workaround.

Yes. I didn't readily see that I needed to specify both x and y, partly because of the documentation and partly because I was deceived by the traceback. (Although xr.core.utils.infix_dims() raises the exception, xr.plot.utils._infer_xy_labels() causes the problem, and the responsible calls are separated by tens of lines in xr.plot.plot._plot2d().

But yes I think it would be good to extend the logic to work when a non-dimension coordinate is passed.

I agree that, if xarray is going to guess, handling non-dimension coordinates would be an improvement. It might be specified to work only with 1-D coordinates and to do nothing for multi-dimensional coordinates.

Alternatively, is it at all preferable to remove the guessing feature? Although the behavior has been present for years, I found mention of it in the documentation only in "What's New." The motivating use case in #1290 could have been addressed instead simply with z.transpose().plot(), which the guessing causes under the hood anyway.

 
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   Plotting in 2D with one non-dimension coordinate given behaves contrary to documentation and can cause cryptic ValueError 769348008

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