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我想为热图创建一个颜色条图例,使标签位于每个离散颜色的中心。请参阅例如波纹管(borrowed from here)matplotlib:颜色条及其文本标签
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.colors import ListedColormap
#discrete color scheme
cMap = ListedColormap(['white', 'green', 'blue','red'])
#data
np.random.seed(42)
data = np.random.rand(4, 4)
fig, ax = plt.subplots()
heatmap = ax.pcolor(data, cmap=cMap)
#legend
cbar = plt.colorbar(heatmap)
cbar.ax.set_yticklabels(['0','1','2','>3'])
cbar.set_label('# of contacts', rotation=270)
# put the major ticks at the middle of each cell
ax.set_xticks(np.arange(data.shape[1]) + 0.5, minor=False)
ax.set_yticks(np.arange(data.shape[0]) + 0.5, minor=False)
ax.invert_yaxis()
#lebels
column_labels = list('ABCD')
row_labels = list('WXYZ')
ax.set_xticklabels(column_labels, minor=False)
ax.set_yticklabels(row_labels, minor=False)
plt.show()
产生以下情节:
理想情况下,我想生成具有四种色彩的传奇人物栏和每个颜色,在标签其中心:0,1,2,3,> 4
谢谢!非常感谢。 – dimka 2013-04-10 18:05:07
我试过了,它几乎可以工作。出于某种原因,由于“cbar.ax.axis('off')”行,轴标签名称“联系人数量”消失。任何方式来保持标签? – dimka 2013-04-10 20:55:17
@dimka看到编辑,只需稍微不同地打开滴答。你仍然必须调整字体看起来更好,但我留给读者的练习;) – tacaswell 2013-04-10 21:02:29