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Backport PR #29622 on branch v3.10.0-doc (DOC: Move "Infinite lines" example from section "pyplot" to "Lines, bars and markers) #29626

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Merged
timhoffm merged 1 commit into from
Feb 14, 2025
Merged

Backport PR #29622 on branch v3.10.0-doc (DOC: Move "Infinite lines" example from section "pyplot" to "Lines, bars and markers) #29626

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30 changes: 17 additions & 13 deletions galleries/examples/pyplots/axline.py → ...examples/lines_bars_and_markers/axline.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,8 @@
sigmoid function.

`~.axes.Axes.axline` draws infinite straight lines in arbitrary directions.

.. redirect-from:: /gallery/pyplot/axline
"""

import matplotlib.pyplot as plt
Expand All @@ -17,28 +19,28 @@
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.axline((0, 0.5), slope=0.25, 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")
plt.legend(fontsize=14)
fig, ax = plt.subplots()
ax.axhline(y=0, color="black", linestyle="--")
ax.axhline(y=0.5, color="black", linestyle=":")
ax.axhline(y=1.0, color="black", linestyle="--")
ax.axvline(color="grey")
ax.axline((0, 0.5), slope=0.25, color="black", linestyle=(0, (5, 5)))
ax.plot(t, sig, linewidth=2, label=r"$\sigma(t) = \frac{1}{1 + e^{-t}}$")
ax.set(xlim=(-10, 10), xlabel="t")
ax.legend(fontsize=14)
plt.show()

# %%
# `~.axes.Axes.axline` can also be used with a ``transform`` parameter, which
# `~.axes.Axes.axline` can also be used with a *transform* parameter, which
# applies to the point, but not to the slope. This can be useful for drawing
# diagonal grid lines with a fixed slope, which stay in place when the
# plot limits are moved.

fig, ax = plt.subplots()
for pos in np.linspace(-2, 1, 10):
plt.axline((pos, 0), slope=0.5, color='k', transform=plt.gca().transAxes)
ax.axline((pos, 0), slope=0.5, color='k', transform=ax.transAxes)

plt.ylim([0, 1])
plt.xlim([0, 1])
ax.set(xlim=(0, 1), ylim=(0, 1))
plt.show()

# %%
Expand All @@ -57,3 +59,5 @@
#
# `~.Axes.axhspan`, `~.Axes.axvspan` draw rectangles that span the Axes in one
# direction and are bounded in the other direction.
#
# .. tags:: component: annotation
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