2 subplots sharing y-axis (no space between) with single color bar

Question

Does anyone have a matplotlib example of two plots sharing the y-axis (with no space between the plots) with a single color bar pertaining to both subplots? I have not been able to find examples of this yet.

Answer 1

I created the following code based on your question. Personally I do not like it to have no space between the subplots at all. If you do want to change this at some point all you need to do is to replace plt.subplots_adjust(wspace = -.059) with plt.tight_layout().

Hope this helps

import numpy
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1 import make_axes_locatable

#Random data
data = numpy.random.random((10, 10))

fig = plt.figure()

ax1 = fig.add_subplot(1,2,1, aspect = "equal")
ax2 = fig.add_subplot(1,2,2, aspect = "equal", sharey = ax1)  #Share y-axes with subplot 1

#Set y-ticks of subplot 2 invisible
plt.setp(ax2.get_yticklabels(), visible=False)

#Plot data
im1 = ax1.pcolormesh(data)
im2 = ax2.pcolormesh(data)

#Define locations of colorbars for both subplot 1 and 2
divider1 = make_axes_locatable(ax1)
cax1 = divider1.append_axes("right", size="5%", pad=0.05)

divider2 = make_axes_locatable(ax2)
cax2 = divider2.append_axes("right", size="5%", pad=0.05)

#Create and remove the colorbar for the first subplot
cbar1 = fig.colorbar(im1, cax = cax1)
fig.delaxes(fig.axes[2])

#Create second colorbar
cbar2 = fig.colorbar(im2, cax = cax2)

#Adjust the widths between the subplots
plt.subplots_adjust(wspace = -.059)

plt.show()

The result is the following: