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[Bug]: Subplot title does not obey padding #21394
Description
Bug summary
Last subplot title does not obey padding.
Code for reproduction
import pandas as pd
import matplotlib.pyplot as plt
df = pd.DataFrame({ "Austria" : [1,2,3,4,5],
"Belgium" : [6,7,8,9,10],
"France" : [11,12,13,14,15] },
index = pd.to_datetime(['2000-01-01', '2000-01-02', '2000-01-03', '2000-01-04', '2000-01-05']))
countryList = df.columns
fig, axs = plt.subplots(len(countryList), 1, figsize = (15, len(countryList) * 5), sharex = True)
for i, c in enumerate(countryList):
axs[i].bar(df.index, df[c])
axs[i].set_title(c, pad=-14)Actual outcome
Expected outcome
"France" subplot title should be aligned as the previous ones.
Operating system
Windows 10 x64
Matplotlib Version
3.4.3
Matplotlib Backend
module://matplotlib_inline.backend_inline
Python version
Python 3.8.5
Jupyter version
jupyter notebook v6.4.5
Other libraries
No response
Installation
pip
Conda channel
No response
Activity
jklymak commentedon Oct 20, 2021
As a workaround you can do
The problem here is that the automatic title placement is interfering. However, I admit I'm a little flummoxed why it is only a problem for the last title.
I think there is a reasonable argument that if the user specifies
padorythey mean for the title to be placed manually.jklymak commentedon Oct 20, 2021
So this is a bit of a funny one. If you remove
sharex=True, none of them are placed with the pad, which is expected behaviour, if a bit undesirable. Basically, the idea of the automatic placement of titles is that you don't want it to overlap axes. So it adjusts upwards, even if pad=-40 until it no longer overlaps.However, if you set
sharex=Truethe axes without xticks and xlabel have the axes position determined byax.get_window_extentwhich at this point in the draw cycle is "None". That leads to the first two axes looking like they are obeying the pad.