matplotlib_200730系列---6、Bar 柱状图

matplotlib_200730系列---6、Bar 柱状图

一、总结

一句话总结：

柱状图使用非常简单，就是bar方法：plt.bar(X,+Y1,facecolor="#9999ff",edgecolor="white")

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 
    plt.text(x, y+0.05, '%.2f' %(y),ha='center',va='bottom')

for x,y in zip(X,Y2):
    # ha: horizontal alignment 
    plt.text(x, -y-0.20, '%.2f' %(y),ha='center',va='bottom')

二、Bar 柱状图

博客对应课程的视频位置：

import matplotlib.pyplot as plt 
import numpy as np 

n=12
X=np.arange(n)
Y1=(1-X/float(n))* np.random.uniform(0.5,1.0,n)
Y2=(1-X/float(n))* np.random.uniform(0.5,1.0,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 
    plt.text(x, y+0.05, '%.2f' %(y),ha='center',va='bottom')

for x,y in zip(X,Y2):
    # ha: horizontal alignment 
    plt.text(x, -y-0.20, '%.2f' %(y),ha='center',va='bottom')
    
plt.xlim(-0.5,n)
plt.xticks(())
plt.ylim(-1.25,1.25)
plt.yticks(())