python matplotlib 生成x的三次方曲线图
效果图：import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(-100,100,100)
y = x**3
plt.figure(num=3,figsize=(8,5)) #num xuhao;figsize long width
l1=plt.plot(x,y,'p')# quta is to return name to plt.legend(handles)
plt.xlim((-100,100))
plt.ylim((-100000,100000))
plt.xlabel('X') #x zhou label
plt.ylabel('Y')
ax = plt.gca()
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none') ##don't display border
ax.xaxis.set_ticks_position('bottom') ##set x zhou
ax.yaxis.set_ticks_position('left')
ax.spines['bottom'].set_position(('data',0))#y 0 postition is x position
ax.spines['left'].set_position(('data',0))
###tu li
# labels can just set one label just post one line
plt.legend(handles=l1,labels='y=x**3',loc='best')##loc=location
plt.show()
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