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Example for sigmoid function with horizontal lines #15914

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Dec 16, 2019
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Example for sigmoid function with horizontal lines #15914

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f1883dd
Example for sigmoid function with horizontal lines
kolibril13 Dec 11, 2019
8874536
simplified script and changed title
kolibril13 Dec 15, 2019
e9538b3
fixed typo
kolibril13 Dec 15, 2019
eb2647f
Fixing heading markup and specifying purpose of plot
kolibril13 Dec 15, 2019
ede4800
remove blank line
kolibril13 Dec 15, 2019
0121bb2
added per-file-ignores sigmoid_function.py : E402
kolibril13 Dec 15, 2019
3c91c81
Rename example file sigmoid_function.py to axline.py
timhoffm Dec 16, 2019
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1 change: 1 addition & 0 deletions .flake8
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Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,7 @@ per-file-ignores =
examples/pyplots/annotation_basic.py: E402
examples/pyplots/annotation_polar.py: E231, E402
examples/pyplots/auto_subplots_adjust.py: E231, E302, E402
examples/pyplots/axline.py: E402
examples/pyplots/boxplot_demo_pyplot.py: E231, E402
examples/pyplots/compound_path_demo.py: E231
examples/pyplots/dollar_ticks.py: E402
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41 changes: 41 additions & 0 deletions examples/pyplots/axline.py
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@@ -0,0 +1,41 @@
"""
======================================
Infinite horizontal and vertical lines
======================================

`~.axes.Axes.axvline` and `~.axes.Axes.axhline` draw infinite vertical /
horizontal lines, at given *x* / *y* positions. They are usually used to mark
special data values, e.g. in this example the center and limit values of the
sigmoid function.
"""
import numpy as np
import matplotlib.pyplot as plt

t = np.linspace(-10, 10, 100)
sig = 1 / (1 + np.exp(-t))

plt.axhline(y=0, color="black", linestyle="--")
plt.axhline(y=0.5, color="black", linestyle=":")
plt.axhline(y=1.0, color="black", linestyle="--")
plt.axvline(color="grey")
plt.plot(t, sig, linewidth=2, label=r"$\sigma(t) = \frac{1}{1 + e^{-t}}$")
plt.xlim(-10, 10)
plt.xlabel("t")
plt.legend(fontsize=14)
plt.show()

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

import matplotlib
matplotlib.pyplot.axhline
matplotlib.pyplot.axvline
matplotlib.axes.Axes.axhline
matplotlib.axes.Axes.axvline