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Description
Bug report
The docstring for plt.step() states that when where='post':
- The y value is continued constantly to the right from every x position, i.e. the interval [x[i], x[i+1]) has the value y[i]."
So if I have a len(2) y array, I should expect the last element to be continued constantly from x[1] to x[2], which means x must be a len(3) array. This makes sense, because x here specifies the edges of the bins. Specifying e.g. y=[1, 2] and x=[0, 1, 4] doesn't work however:
Code for reproduction
import numpy as np
import matplotlib.pyplot as plt
data = [1, 2]
bin_edges = [0, 1, 4]
fig, ax = plt.subplots()
ax.step(data, bin_edges, where='post')Actual outcome
File "test.py", line 8, in <module>
ax.step(data, bin_edges, where='post')
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/site-packages/matplotlib/axes/_axes.py", line 2110, in step
return self.plot(x, y, *args, data=data, **kwargs)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/site-packages/matplotlib/axes/_axes.py", line 1646, in plot
lines = [*self._get_lines(*args, data=data, **kwargs)]
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/site-packages/matplotlib/axes/_base.py", line 216, in __call__
yield from self._plot_args(this, kwargs)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/site-packages/matplotlib/axes/_base.py", line 342, in _plot_args
raise ValueError(f"x and y must have same first dimension, but "
ValueError: x and y must have same first dimension, but have shapes (2,) and (3,)
Expected outcome
The bins should be drawn between [0, 1] and [1, 4].
Matplotlib version
- Operating system: macos 10.15.4
- Matplotlib version: 3.2.1, installed from pip
- Matplotlib backend (
print(matplotlib.get_backend())): Qt5Agg - Python version: 3.8.2
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