如何将图例从 Max 反转为 Min [重复]

Question

这是网络上的一个例子https://matplotlib.org/gallery/axes_grid1/simple_colorbar.html#sphx-glr-gallery-axes-grid1-simple-colorbar-py

我想反转图例，让它看起来像这样：

这意味着图例中底部的最大值和顶部的最小值。 使颜色条“镜像”

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

ax = plt.subplot(111)
im = ax.imshow(np.arange(100).reshape((10, 10)))

# create an axes on the right side of ax. The width of cax will be 5%
# of ax and the padding between cax and ax will be fixed at 0.05 inch.
divider = make_axes_locatable(ax)
cax = divider.append_axes("right", size="5%", pad=0.05)

plt.colorbar(im, cax=cax)

plt.show()

Answer 1

您可以访问彩条的ax，然后调用invert_yaxis()。这将反转颜色条的颜色和刻度标签。

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

ax = plt.subplot(111)
im = ax.imshow(np.arange(100).reshape((10, 10)))

# create an axes on the right side of ax. The width of cax will be 5%
# of ax and the padding between cax and ax will be fixed at 0.05 inch.
divider = make_axes_locatable(ax)
cax = divider.append_axes("right", size="5%", pad=0.05)

plt.colorbar(im, cax=cax)
cax.invert_yaxis()

plt.show()

PS：如果没有提供颜色条的ax，你可以访问它

cbar = plt.colorbar(im)
cbar.ax.invert_yaxis()