如果将数组[-0.4，0.4]的值转换为范围[0，100]，就可以绘制所需的图形。
这就是我在下面的例子中所做的：

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

size = 50
A = np.array([randint(-4, 4)/10 for _ in range(size*size)])
A = (A*10 + 4)*12.5    # Translate values from [-0.4, 0.4] to [0, 100].
B = A.reshape((size, size))

ax = plt.subplot()

im = ax.imshow(B)
divider = make_axes_locatable(ax)
cax = divider.append_axes("right", size="5%", pad=0.05)
im.set_clim(0, 100)
plt.colorbar(im, cax=cax)
plt.show()

输出：x1c 0d1x