用双刻度绘制颜色条 [英] Draw colorbar with twin scales

问题描述

我想画一个(垂直)颜色条，它的每一侧都有两个不同的比例(对应于相同数量的两个不同单位).一方面考虑华氏温度，另一方面考虑摄氏温度.显然，我需要分别为每一侧指定刻度.

I'd like to draw a (vertical) colorbar, which has two different scales (corresponding to two different units for the same quantity) on each side. Think Fahrenheit on one side and Celsius on the other side. Obviously, I'd need to specify the ticks for each side individually.

知道我该怎么做吗?

推荐答案

那应该让您入门:

import matplotlib.pyplot as plt
import numpy as np

# generate random data
x = np.random.randint(0,200,(10,10))
plt.pcolormesh(x)

# create the colorbar
# the aspect of the colorbar is set to 'equal', we have to set it to 'auto',
# otherwise twinx() will do weird stuff.
cbar = plt.colorbar()
pos = cbar.ax.get_position()
cbar.ax.set_aspect('auto')

# create a second axes instance and set the limits you need
ax2 = cbar.ax.twinx()
ax2.set_ylim([-2,1])

# resize the colorbar (otherwise it overlays the plot)
pos.x0 +=0.05
cbar.ax.set_position(pos)
ax2.set_position(pos)

plt.show()

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