Bug report

Bug summary

Using the bottom argument in matplotlib hist() together with histtype='stepfilled' always results in the first patch is drawn starting from (x,y)=(bins[0], 0). Using histtype='bar' results in the expected outcome.

Code for reproduction

import matplotlib.pyplot as plt

fig, ax = plt.subplots(nrows=2)

x = [1, 1, 1, 2, 2, ]
bins = [1, 1.5, 2, 3]
bottom = [1, 0, 3]

ax[0].hist(x=x, bins=bins, bottom=bottom, histtype='stepfilled')
ax[0].set_ylim(0, 10)

ax[1].hist(x=x, bins=bins, bottom=bottom, histtype='bar')
ax[1].set_ylim(0, 10)

Actual outcome

Expected outcome

Patch of first bin starting at bottom[0]

Matplotlib version

• Operating system: Windows
• Matplotlib version: 3.2.1
• Matplotlib backend (print(matplotlib.get_backend())): nbAgg
• Python version: 3.6
• Jupyter version (if applicable):
• Other libraries:

pip