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  • plotting facet grid with singleton dimension should create a facet grid with size 1 · 4 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1494018319 https://github.com/pydata/xarray/issues/7552#issuecomment-1494018319 https://api.github.com/repos/pydata/xarray/issues/7552 IC_kwDOAMm_X85ZDOkP akanshajais 85181086 2023-04-03T09:51:16Z 2023-04-08T11:37:40Z NONE

The reason why you are getting a KeyError in your first example when trying to plot with col='y' is because when y is a dimension with length 1, xarray automatically drops the dimension and promotes its coordinates to 1D.

In your example, the y dimension has length 1, so it is dropped, and da.coords['y'] returns a scalar value rather than a 1D coordinate array. When you try to plot with col='y', xarray looks for the 'y' key in the coordinates dictionary, which doesn't exist, hence the KeyError.

To work around this, you can manually promote the y coordinate to a 1D array using the expand_dims method:

``` import xarray as xr import numpy as np

da = xr.DataArray(np.random.rand(3,1), dims=('x', 'y')) da.coords['y'] = da.coords['y'].expand_dims('y') da.plot(col='y')

``` This will ensure that the y coordinate is always a 1D array, even when the dimension it represents has length 1.

 
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   plotting facet grid with singleton dimension should create a facet grid with size 1 1596890616
1447568902 https://github.com/pydata/xarray/issues/7552#issuecomment-1447568902 https://api.github.com/repos/pydata/xarray/issues/7552 IC_kwDOAMm_X85WSCYG dcherian 2448579 2023-02-28T04:46:24Z 2023-02-28T04:46:24Z MEMBER

See #620 (!)

Maybe we should exclude col, row dims from the squeeze?

This seems sensible.

 
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   plotting facet grid with singleton dimension should create a facet grid with size 1 1596890616
1447067702 https://github.com/pydata/xarray/issues/7552#issuecomment-1447067702 https://api.github.com/repos/pydata/xarray/issues/7552 IC_kwDOAMm_X85WQIA2 headtr1ck 43316012 2023-02-27T20:50:13Z 2023-02-27T20:50:13Z COLLABORATOR

@liorella-qm in the meantime you can use da.plot.line(col='y') as a workaround

 
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   plotting facet grid with singleton dimension should create a facet grid with size 1 1596890616
1447057892 https://github.com/pydata/xarray/issues/7552#issuecomment-1447057892 https://api.github.com/repos/pydata/xarray/issues/7552 IC_kwDOAMm_X85WQFnk headtr1ck 43316012 2023-02-27T20:43:00Z 2023-02-27T20:48:19Z COLLABORATOR

This is caused by the squeeze() here: https://github.com/pydata/xarray/blob/41949209b6cfb0d5c25d000b1e0c5739b513385c/xarray/plot/dataarray_plot.py#L267

@Illviljan do you know why this is required? I assume you want to remove singleton dimensions to better choose the correct plot method?

Maybe we should exclude col, row dims from the squeeze? something like: darray.squeeze(d for d, s in darray.sizes.items() if s == 1 and d not in (row, col, hue))

 
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   plotting facet grid with singleton dimension should create a facet grid with size 1 1596890616

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