颜色条上的日志标签matplotlib [英] Log labels on colorbar matplotlib

问题描述

我有一个对数的imshow图，创建了颜色条时，其轴标签和刻度线是对数的，但是由于值的范围很短(0-50)，所以颜色条看起来像这样:

I have a logarithmic imshow figure, and when the colorbar is created, its axis labels and ticks are logarithmic, but because of the short range (0-50) of the values, the colorbar looks like this:

我希望它显示为沿轴间隔(对数间距)为0、5、10、20、50.

and I would like it to instead show as 0, 5, 10, 20, 50 spaced along the axis (logarithmic spacing).

我似乎无法使它正常工作.

I can't seem to get this to work.

感谢您的帮助.

推荐答案

使用 LogFormatter 类并将 labelOnlyBase 设置为 False :

Use the LogFormatter class and set labelOnlyBase to False:

import matplotlib.pyplot as plt
import numpy as np
import matplotlib.colors
from matplotlib.ticker import LogFormatter 

A = np.random.rand(50,50)*50
plt.imshow(A, norm=matplotlib.colors.LogNorm())
formatter = LogFormatter(10, labelOnlyBase=False) 
cb = plt.colorbar(ticks=[1,5,10,20,50], format=formatter)
plt.show()

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