matplotlib图形入门代码

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

# 分区
# plt.subplot(3,2,3)
# plt.plot([3,1,4,5,2])
# plt.ylabel("Grade")
# plt.savefig('test',dpi=600)

# 不同颜色，不同形式的曲线
# a=np.arange(10)
# plt.plot(a,'v--',a*1.5,'go-',a*2.5,'r:1',a*3.5,'y>:')

# pyplot中文显示：
# matplotlib.rcParams['font.family']='SimHei'
# plt.plot([3,1,4,5,2])
# plt.ylabel('纵坐标')
# plt.savefig('test',dpi=600)

# a = np.arange(0.0,5.0, 0.02)
# plt.plot(a, np.cos( 2*np.pi*a), 'r--')
# plt.xlabel('横轴:时间' , fontproperties= 'SimHei', fontsize=15, color= 'green')
# plt.ylabel('纵轴:振幅',fontproperties= 'SimHei', fontsize=15)
# plt.title(r'正弦波实例$y=cos(2pi x)$' ,fontproperties='simHei' , fontsize=25)
# plt.text(2,1,r'$mu=100$ ', fontsize=15)

#饼图的绘制
# labels='frog','Cat','Dog' ,'duck'
# sizes=[15,30,45,10]
# explode=(0,0.1,0,0)
# plt.pie(sizes,explode=explode,labels=labels,autopct='%1.1f%%',shadow=False,startangle=45)
#startangle起始角度

#散点图的绘制
import numpy as np
import matplotlib.pyplot as plt
fig,ax=plt.subplots()
ax.plot(100*np.random.randn(100),100*np.random.randn(100),'o')#'O'设置为标点的方式表现出来

#展示
# plt.axis([-1,6,-2,2])
# plt.grid(True) #栅格
plt.show()