html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/pull/5763#issuecomment-912724289,https://api.github.com/repos/pydata/xarray/issues/5763,912724289,IC_kwDOAMm_X842ZxFB,14371165,2021-09-03T18:19:02Z,2021-09-03T18:19:02Z,MEMBER,"What would you expect the plot to look like if you input a complex number or a multiindex along the x-axis?
I think I would expect it to be shown like a flattened array. And you can kind of get away with that if you cast the arrays to string before hand.
 
<details>

```python
x = 1j * np.arange(0, 5)
y = np.arange(5, 10)
plt.plot(x, y)
ComplexWarning: Casting complex values to real discards the imaginary part
  return np.asarray(x, float)
```
![image](https://user-images.githubusercontent.com/14371165/132037646-8ade69af-9201-4218-a2d2-1cb1c6954328.png)

```python
x = 1j * np.arange(0, 5)
y = np.arange(5, 10)
plt.plot(np.vectorize(str)(x), y)
```
![image](https://user-images.githubusercontent.com/14371165/132037845-cf04623e-5f36-4d65-b5b4-b2433366fe14.png)


```python
x = 1j + np.arange(0, 5)
y = np.arange(5, 10)
plt.plot(np.vectorize(str)(x), y)
```
![image](https://user-images.githubusercontent.com/14371165/132039166-720de3f9-ef16-419b-aaf6-68f9dac6c59f.png)


```python
import pandas as pd
arrays = [[1, 1, 2, 2], ['red', 'blue', 'red', 'blue']]
a = pd.MultiIndex.from_arrays(arrays, names=('number', 'color')).to_numpy()
b = np.arange(4, 8)
plt.plot(np.vectorize(str)(a), b)
```
![image](https://user-images.githubusercontent.com/14371165/132048322-fb83cdbf-9720-4ed4-b75e-52bb7a41055f.png)
</details>","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,987559143
https://github.com/pydata/xarray/pull/5763#issuecomment-912707634,https://api.github.com/repos/pydata/xarray/issues/5763,912707634,IC_kwDOAMm_X842ZtAy,2448579,2021-09-03T17:50:20Z,2021-09-03T17:50:20Z,MEMBER,"The error for multiindex plotting is not very informative ""setting array element  with sequence"" so I would still keep `_ensure_plottable` to raise a nice error for that.

for the tests that now work, we should  check that the output is reasonable, so I wouldn't delete them","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,987559143
https://github.com/pydata/xarray/pull/5763#issuecomment-912620738,https://api.github.com/repos/pydata/xarray/issues/5763,912620738,IC_kwDOAMm_X842ZXzC,2448579,2021-09-03T15:26:02Z,2021-09-03T15:26:02Z,MEMBER,"Thanks @dschwoerer This makes sense to me.

A lot of failed tests are checking for the raised error. We will need to update these to make sure the plotting worked.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,987559143