确保 0 在 RdBu 颜色条中变为白色

问题描述

我使用以下代码段创建了一个热图:

 将numpy导入为np导入matplotlib.pyplot作为pltd = np.random.normal(.4,2，(10,10))plt.imshow(d,cmap=plt.cm.RdBu)plt.colorbar()plt.show()

结果如下图所示:

现在，由于数据的中点不为0，因此颜色表中值为0的单元格不是白色，而是略带红色.

我如何强制颜色图使max = blue，min = red和0 = white?

解决方案

使用

I create a heatmap with the following snippet:

import numpy as np
import matplotlib.pyplot as plt
d = np.random.normal(.4,2,(10,10))
plt.imshow(d,cmap=plt.cm.RdBu)
plt.colorbar()
plt.show()

The result is plot below:

Now, since the middle point of the data is not 0, the cells in which the colormap has value 0 are not white, but rather a little reddish.

How do I force the colormap so that max=blue, min=red and 0=white?

解决方案

Use a DivergingNorm.

Note: From matplotlib 3.2 onwards DivergingNorm is renamed to TwoSlopeNorm

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.colors as mcolors

d = np.random.normal(.4,2,(10,10))

norm = mcolors.DivergingNorm(vmin=d.min(), vmax = d.max(), vcenter=0)
plt.imshow(d, cmap=plt.cm.RdBu, norm=norm)

plt.colorbar()
plt.show()

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