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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
593860909 MDU6SXNzdWU1OTM4NjA5MDk= 3933 plot.line breaks depending on coordinate shape 11750960 closed 0     2 2020-04-04T13:27:35Z 2020-04-04T18:42:10Z 2020-04-04T17:57:20Z CONTRIBUTOR      

plot.line breaks depending on coordinate shape, see the code below:

```python x = np.arange(10) y = np.arange(20)

ds = xr.Dataset(coords={'x': x, 'y': y})

ds = ds.assign_coords(z=ds.y+ds.x) # goes through

ds = ds.assign_coords(z=ds.x+ds.y) # breaks ds['v'] = (ds.x+ds.y) ds['v'].plot.line(y='z', hue='x') This breaks with the following error: ... ~/.miniconda3/envs/equinox/lib/python3.7/site-packages/matplotlib/axes/_base.py in _plot_args(self, tup, kwargs) 340 341 if x.shape[0] != y.shape[0]: --> 342 raise ValueError(f"x and y must have same first dimension, but " 343 f"have shapes {x.shape} and {y.shape}") 344 if x.ndim > 2 or y.ndim > 2:

ValueError: x and y must have same first dimension, but have shapes (20, 10) and (10, 20) ```

I would have expected that that dimension order would not matter

Versions

Output of `xr.show_versions()` INSTALLED VERSIONS ------------------ commit: None python: 3.7.6 | packaged by conda-forge | (default, Mar 23 2020, 23:03:20) [GCC 7.3.0] python-bits: 64 OS: Linux OS-release: 3.12.53-60.30-default machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: en_US.UTF-8 libhdf5: 1.10.5 libnetcdf: 4.7.4 xarray: 0.15.1 pandas: 1.0.3 numpy: 1.18.1 scipy: 1.4.1 netCDF4: 1.5.3 pydap: None h5netcdf: None h5py: None Nio: None zarr: 2.4.0 cftime: 1.1.1.2 nc_time_axis: None PseudoNetCDF: None rasterio: None cfgrib: None iris: None bottleneck: None dask: 2.13.0 distributed: 2.13.0 matplotlib: 3.2.1 cartopy: 0.17.0 seaborn: 0.10.0 numbagg: None setuptools: 46.1.3.post20200325 pip: 20.0.2 conda: None pytest: None IPython: 7.13.0 sphinx: None
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