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Jan 10, 2019
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Update example Step Demo #13148

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1 change: 1 addition & 0 deletions .flake8
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Expand Up @@ -146,6 +146,7 @@ per-file-ignores =
examples/lines_bars_and_markers/joinstyle.py: E402
examples/lines_bars_and_markers/scatter_piecharts.py: E402
examples/lines_bars_and_markers/span_regions.py: E402
examples/lines_bars_and_markers/step_demo.py: E402
examples/misc/agg_buffer.py: E402
examples/misc/anchored_artists.py: E501
examples/misc/contour_manual.py: E501
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46 changes: 29 additions & 17 deletions examples/lines_bars_and_markers/step_demo.py
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Expand Up @@ -3,30 +3,42 @@
Step Demo
=========

Example step plots.
This example demonstrates the use of `.pyplot.step` for piece-wise constant
curves. In particular, it illustrates the effect of the parameter *where*
on the step position.

The circular markers created with `.pyplot.plot` show the actual data
positions so that it's easier to see the effect of *where*.

"""
import numpy as np
from numpy import ma
import matplotlib.pyplot as plt

x = np.arange(1, 7, 0.4)
y0 = np.sin(x)
y = y0.copy() + 2.5
x = np.arange(14)
y = np.sin(x / 2)

plt.step(x, y, label='pre (default)')
plt.step(x, y + 2, label='pre (default)')
plt.plot(x, y + 2, 'C0o', alpha=0.5)

y -= 0.5
plt.step(x, y, where='mid', label='mid')
plt.step(x, y + 1, where='mid', label='mid')
plt.plot(x, y + 1, 'C1o', alpha=0.5)

y -= 0.5
plt.step(x, y, where='post', label='post')
plt.plot(x, y, 'C2o', alpha=0.5)

y = ma.masked_where((y0 > -0.15) & (y0 < 0.15), y - 0.5)
plt.step(x, y, label='masked (pre)')

plt.legend()

plt.xlim(0, 7)
plt.ylim(-0.5, 4)

plt.legend(title='Parameter where:')
plt.show()

#############################################################################
#
# ------------
#
# References
# """"""""""
#
# The use of the following functions, methods, classes and modules is shown
# in this example:

import matplotlib
matplotlib.axes.Axes.step
matplotlib.pyplot.step