Bug report

Bug summary

Docstring for plt.bar:

matplotlib.pyplot.bar(left, height, width=0.8, bottom=None, hold=None, data=None, **kwargs)
Make a bar plot.

Make a bar plot with rectangles bounded by:

left, left + width, bottom, bottom + height
(left, right, bottom and top edges)

However, "left" is in fact the center value of the resulting bars.

Code for reproduction

# Paste your code here
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import numpy as np
import matplotlib.pyplot as plt
lefts = np.asarray((0, 100, 200, 300, 400))
plt.bar(left=lefts, height=lefts, width=100)
plt.bar(left=lefts, height=lefts, width=75)
plt.bar(left=lefts, height=lefts, width=50)
plt.bar(left=lefts, height=lefts, width=25)

Actual outcome

# If applicable, paste the console output here
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Expected outcome
Bars should be left-aligned to the "left" value.
As the attached plot shows: Bars are centered on "left" value, and not left-aligned to it.

Matplotlib version

• Operating System: Fedora Linux 26
• Matplotlib Version: 2.0.2
• Python Version: 3.6
• Jupyter Version (if applicable):
• Other Libraries:

matplotlib installed using pip