issue_comments: 970851123

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https://github.com/pydata/xarray/issues/4562#issuecomment-970851123 https://api.github.com/repos/pydata/xarray/issues/4562 970851123 IC_kwDOAMm_X8453gMz 20617032 2021-11-16T23:39:09Z 2021-11-16T23:39:09Z NONE

I tested the method of adding a new level with mi.values, which worked, though x='x' must still be specified:

``` import numpy as np import pandas as pd import xarray as xr

data = np.random.rand(50,5)

x_idx = np.linspace(0, 50)

mi_idx1 = ['a','b','c','d','e'] mi_idx2 = [1,2,3,4,5]

mi = pd.MultiIndex.from_arrays([mi_idx1,mi_idx2], names=['mi_idx1', 'mi_idx2'])

coords = { 'x': x_idx, 'mi': mi }

da = xr.DataArray(data, coords=coords, dims = ['x', 'mi'])

da = da.assign_coords(mi_plot = ('mi', da.indexes['mi'].values)) # add a level for plot display

da.plot(hue='mi_plot', x='x') ```

It seems like this potentially happen behind the scenes, but I'm not sure. 

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