Problems with colorbar and multiple subplot

Question

I tried to plot two images next to each other with one corresponding colorbar for both of them. My code is

plt.figure(1)
plt.subplot (121)
plt.title('1')
plt.imshow(matrix_lg, interpolation='bilinear', cmap=plt.cm.jet, vmin=np.log10(minVal), vmax = np.log10(maxVal))
plt.subplot(122)
plt.title('2')
plt.imshow(matrix_lg, interpolation='bilinear', cmap=plt.cm.jet, vmin=np.log10(minVal), vmax = np.log10(maxVal))
plt.colorbar()

Python now attaches the colorbar to the second subplot and shrinks it therefore. But I want both plots to be the same size. How can I detach the colorbar of the subplots?

tmdavison · Accepted Answer · 2015-08-11 14:59:44Z

4

you can create a separate Axes instance for the colorbar

import matplotlib.pyplot as plt
import numpy as np

plt.figure(1)
# Create room on the right
plt.gcf().subplots_adjust(right=0.8)

plt.subplot (121)
plt.title('1')
plt.imshow(np.random.rand(10,10), interpolation='bilinear', cmap=plt.cm.jet)
plt.subplot(122)
plt.title('2')
plt.imshow(np.random.rand(10,10), interpolation='bilinear', cmap=plt.cm.jet)

# Make a new Axes instance
cbar_ax = plt.gcf().add_axes([0.85, 0.15, 0.05, 0.7])
plt.colorbar(cax=cbar_ax)

plt.show()

EDIT:

you can change the height of the colorbar to be more like the height of the plots by changing the add_axes command. That takes a rectangle as the argument [left, bottom, width, height], so just change the bottom and height to suit your needs

edited Aug 11, 2015 at 14:59

answered Aug 11, 2015 at 14:49

tmdavison

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