Manually-defined axis labels for Matplotlib imshow()

问题

The following code:

import matplotlib.pyplot as plt
import numpy as np

data = np.random.randint(0, 100, size=(10, 10))
plt.imshow(data, cmap='jet', interpolation='nearest')
plt.show()

Gives the following figure:

However, instead of the axis labels corresponding to the index in the array, I want to manually define them. For example, instead of the axis labels being (0, 2, 4, 6, 8) as above, I want them to be (0, 10, 20, 30 ...).

Here is the code I have tried for this:

import matplotlib.pyplot as plt
import numpy as np

data = np.random.randint(0, 100, size=(10, 10))
labels = range(0, 100, 10)
plt.imshow(data, cmap='jet', interpolation='nearest')
plt.xticks(labels)
plt.yticks(labels)
plt.show()

However, this gives the following figure:

How can I achieve a figure with an appearance like the first one, but with axis labels like the second one?

回答1:

The best way to do this is to modify the extent values in argument of your imshow :

import matplotlib.pyplot as plt
import numpy as np

data = np.random.randint(0, 100, size=(10, 10))
plt.imshow(data, cmap='jet', interpolation='nearest', extent=[0, 100, 0, 100])
plt.show()

回答2:

Define your axes and modify the xticklabels, not the axis itself. Something like this:

fig, ax1 = plt.subplots(1,1)
data = np.random.randint(0, 100, size=(10, 10))
ax1.imshow(data, cmap='jet', interpolation='nearest')
ax1.set_xticklabels(['', 0,10,20,30,40])

来源：https://stackoverflow.com/questions/33283601/manually-defined-axis-labels-for-matplotlib-imshow

标签

python

matplotlib