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bars in plt.bar graph centered on "left" value #8882
Description
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
Activity
QuLogic commentedon Jul 15, 2017
This is expected, if odd behaviour;
leftcannot be renamed tocenterdue to API compatibility. See #7954.skjaeve commentedon Jul 15, 2017
WeatherGod commentedon Jul 15, 2017
QuLogic commentedon Jul 15, 2017
It doesn't exactly say it's the default, but it does say that the rectangles will be
(left, left+width)which is not quite correct when it's centred.skjaeve commentedon Jul 17, 2017
The first paragraph in the function documentation says:
which clearly implies that "left" is in fact the left edges of the drawn rectangles. If this can't be fixed easily, please at least update the first paragraph of the documentation to explain the "align" keyword.
WeatherGod commentedon Jul 17, 2017
API: change signature of bar and barh
API: change signature of bar and barh
API: change signature of bar and barh
API: change signature of bar and barh