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DOC: Improve inverted axis example #28055

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Apr 12, 2024
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DOC: Improve inverted axis example #28055

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38 changes: 24 additions & 14 deletions galleries/examples/subplots_axes_and_figures/invert_axes.py
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Original file line number Diff line number Diff line change
@@ -1,25 +1,35 @@
"""
===========
Invert Axes
===========
=============
Inverted axis
=============

You can use decreasing axes by flipping the normal order of the axis
limits
This example demonstrates two ways to invert the direction of an axis:

- If you want to set *explicit axis limits* anyway, e.g. via `~.Axes.set_xlim`, you
can swap the limit values: ``set_xlim(4, 0)`` instead of ``set_xlim(0, 4)``.
- Use `.Axis.set_inverted` if you only want to invert the axis *without modifying
the limits*, i.e. keep existing limits or existing autoscaling behavior.
"""

import matplotlib.pyplot as plt
import numpy as np

t = np.arange(0.01, 5.0, 0.01)
s = np.exp(-t)
x = np.arange(0.01, 4.0, 0.01)
y = np.exp(-x)

fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(6.4, 4), layout="constrained")
fig.suptitle('Inverted axis with ...')

fig, ax = plt.subplots()
ax1.plot(x, y)
ax1.set_xlim(4, 0) # inverted fixed limits
ax1.set_title('fixed limits: set_xlim(4, 0)')
ax1.set_xlabel('decreasing x ⟶')
ax1.grid(True)

ax.plot(t, s)
ax.set_xlim(5, 0) # decreasing time
ax.set_xlabel('decreasing time (s)')
ax.set_ylabel('voltage (mV)')
ax.set_title('Should be growing...')
ax.grid(True)
ax2.plot(x, y)
ax2.xaxis.set_inverted(True) # inverted axis with autoscaling
ax2.set_title('autoscaling: set_inverted(True)')
ax2.set_xlabel('decreasing x ⟶')
ax2.grid(True)

plt.show()