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29# -*- coding: utf-8 -*-
import matplotlib.pyplot as plt
import numpy as np
n = 10
X = np.arange(n)
# 均匀分布
Y1 = (1-X/float(n))*np.random.uniform(0.5,1,n)
Y2 = (1-X/float(n))*np.random.uniform(0.5,1,n)
plt.bar(X,+Y1,facecolor='#9999ff',edgecolor='white')
plt.bar(X,-Y2,facecolor='#ff9999',edgecolor='white')
for x,y in zip(X,Y1):
# ha: horizontal alignment
# va: vertical alignment
plt.text(x,y,'%.2f'%y,ha='center',va='bottom')
for x,y in zip(X,Y2):
plt.text(x,-y,'%.2f'%y,ha='center',va='top')
#设置显示范围
plt.xlim(-.5,n)
plt.ylim(-1.25,1.25)
plt.xticks(())
plt.yticks(())
plt.savefig("/home/xuleilx/workspace/github/github_pages/public/images/bar_map.png")
plt.show()
结果：
