Include axline() in infinite lines example

timhoffm · timhoffm · commit da7eff45ca89 · 2020-01-26T18:45:43.000+01:00
diff --git a/examples/pyplots/axline.py b/examples/pyplots/axline.py
@@ -1,12 +1,14 @@
 """
-======================================
-Infinite horizontal and vertical lines
-======================================
+==============
+Infinite 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.
+
+`~.axes.Axes.axline` draws infinite straight lines in arbitrary directions.
 """
 import numpy as np
 import matplotlib.pyplot as plt
@@ -18,6 +20,7 @@
 plt.axhline(y=0.5, color="black", linestyle=":")
 plt.axhline(y=1.0, color="black", linestyle="--")
 plt.axvline(color="grey")
+plt.axline((0, 0.5), (2, 1), color="black", linestyle=(0, (5, 5)))
 plt.plot(t, sig, linewidth=2, label=r"$\sigma(t) = \frac{1}{1 + e^{-t}}$")
 plt.xlim(-10, 10)
 plt.xlabel("t")
@@ -37,5 +40,7 @@
 import matplotlib
 matplotlib.pyplot.axhline
 matplotlib.pyplot.axvline
+matplotlib.pyplot.axline
 matplotlib.axes.Axes.axhline
 matplotlib.axes.Axes.axvline
+matplotlib.axes.Axes.axline
