Matplotlib not setting minimum y-axis

Question

This is probably a simple question, but setting the bottom y=axis simply isn't working. I believe it is occurring as a result of me using the area chart, but I'm not sure how to resolve it. Here is my current code.

fig, (ax1, ax2) = plt.subplots(2, sharex=True, sharey=True)
fig.suptitle('SPY Chart')
ax1.set_ylim(bottom=150, top=450)
spyData['Close'].plot(kind='area',ax=ax1)
spyData['Close'].plot(ax=ax2)

Changing the value of the top works perfectly well, but the bottom won't.

with sharey=True the y-axes of both plots are shared. Changing one will automatically change the other one. If this isn't what you want, you can set sharey=False (the default). — JohanC
– JohanC, Commented Jan 23, 2021 at 19:11
@JohanC I would like it to be shared, but for 150 to be the bottom for both. Is this possible with sharey enabled? — John
– John, Commented Jan 23, 2021 at 19:17

JohanC · Accepted Answer · 2021-01-23 21:28:10Z

1

The plot commands called after setting the ylims changes these limits again. Calling set_ylim() after the plot commands solves this:

import numpy as np
import matplotlib.pyplot as plt
import pandas as pd

spyData = pd.DataFrame({'Close': np.random.normal(0.1, 10, 200).cumsum() + 200})
spyData.set_index(pd.date_range('20200101', periods=len(spyData)), inplace=True)

fig, (ax1, ax2) = plt.subplots(2, sharex=True, sharey=True)
spyData['Close'].plot(kind='area', ax=ax1)
spyData['Close'].plot(ax=ax2)
ax1.set_ylim(bottom=150, top=450)
ax1.margins(x=0) # suppress white space left and right
plt.show()

edited Jan 23, 2021 at 21:28

answered Jan 23, 2021 at 21:22

JohanC

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