Version 3.1.2
matplotlib

Related Topics

Easily creating subplotsΒΆ

In early versions of matplotlib, if you wanted to use the pythonic API and create a figure instance and from that create a grid of subplots, possibly with shared axes, it involved a fair amount of boilerplate code. e.g.

Easily creating subplots
========================

In early versions of matplotlib, if you wanted to use the pythonic API
and create a figure instance and from that create a grid of subplots,
possibly with shared axes, it involved a fair amount of boilerplate
code.  e.g.
"""

import matplotlib.pyplot as plt
import numpy as np

x = np.random.randn(50)

# old style
fig = plt.figure()
ax1 = fig.add_subplot(221)
ax2 = fig.add_subplot(222, sharex=ax1, sharey=ax1)
ax3 = fig.add_subplot(223, sharex=ax1, sharey=ax1)
ax3 = fig.add_subplot(224, sharex=ax1, sharey=ax1)
Traceback (most recent call last):
  File "/build/matplotlib-mO9dyQ/matplotlib-3.1.2/examples/recipes/create_subplots.py", line 1
    Easily creating subplots
           ^
SyntaxError: invalid syntax

Fernando Perez has provided a nice top level method to create in subplots() (note the "s" at the end) everything at once, and turn on x and y sharing for the whole bunch. You can either unpack the axes individually...

# new style method 1; unpack the axes
fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(2, 2, sharex=True, sharey=True)
ax1.plot(x)

or get them back as a numrows x numcolumns object array which supports numpy indexing

# new style method 2; use an axes array
fig, axs = plt.subplots(2, 2, sharex=True, sharey=True)
axs[0, 0].plot(x)

plt.show()

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