issues: 592629388

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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
592629388 MDU6SXNzdWU1OTI2MjkzODg= 3927 use level of a MultiIndex for plotting? 10194086 closed 0     1 2020-04-02T13:24:05Z 2020-05-25T16:32:15Z 2020-05-25T16:32:15Z MEMBER      

It would be nice to be able to use a level of a MultiIndex for plotting.

MCVE Code Sample

```python import numpy as np import xarray as xr

da = xr.DataArray( np.random.randn(10), dims="x", coords=dict( a=("x", np.arange(10, 20)), b=("x", np.arange(1, 11)) ) )

da = da.set_index(x=["a", "b"]) da This creates the following DataArraypython <xarray.DataArray (x: 10)> array([-1.34516338, 0.97644817, -0.24032189, -0.70112418, -0.8686898 , -0.55607078, 0.56618151, 1.62847463, 0.84947296, -0.5775504 ]) Coordinates: * x (x) MultiIndex - a (x) int64 10 11 12 13 14 15 16 17 18 19 - b (x) int64 1 2 3 4 5 6 7 8 9 10 ```

Is there a way to plot a line using one of the levels of the MultiIindex? python da.plot(x="a") returns python ValueError: x must be either None or one of ('x')

python da.plot() returns

python TypeError: Plotting requires coordinates to be numeric or dates of type np.datetime64, datetime.datetime, cftime.datetime or pd.Interval. (which makes sense). If da is a 2D Variable the error is python ValueError: x and y must be coordinate variables

Expected Output

A line plot

Versions

Output of `xr.show_versions()` INSTALLED VERSIONS ------------------ commit: b3bafeefbd6e6d70bce505ae1f0d9d5a2b015089 python: 3.7.3 | packaged by conda-forge | (default, Jul 1 2019, 21:52:21) [GCC 7.3.0] python-bits: 64 OS: Linux OS-release: 4.15.0-91-generic 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: 4.7.1 xarray: 0.11.1+335.gb0c336f6 pandas: 0.25.3 numpy: 1.17.3 scipy: 1.3.1 netCDF4: 1.5.3 pydap: installed h5netcdf: 0.7.4 h5py: 2.10.0 Nio: None zarr: 2.3.2 cftime: 1.0.4.2 nc_time_axis: None PseudoNetCDF: installed rasterio: 1.1.0 cfgrib: 0.9.5.4 iris: None bottleneck: 1.2.1 dask: 2.6.0 distributed: 2.6.0 matplotlib: 3.1.2 cartopy: 0.17.0 seaborn: 0.9.0 numbagg: None pint: None setuptools: 41.6.0.post20191101 pip: 19.3.1 conda: None pytest: 5.2.2 IPython: 7.9.0 sphinx: None 
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   completed 13221727 issue

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