Pythonでmatplotlibを使ってx軸を（0,0）に通す方法を教えてください。

Question

水平軸を原点に通すにはどうすればよいですか？

import numpy as np 
import matplotlib.pyplot as plt 

rateList=[0,0.08,.1,.12,.15,.175,.225,.25,.275,.3,.325,.35] 

list1=[-316.8,-424,-2.8,622,658,400,83,16.8,0] 
NPV_Profile1=[np.npv(x,list1) for x in rateList] 

list2=[-496,-760,84,1050.4,658,400,83,16.8,0] 
NPV_Profile2=[np.npv(x,list2) for x in rateList] 

plt.plot(rateList,NPV_Profile1,rateList,NPV_Profile2) 

plt.show() 

Answer 1

で試してみてください：

import numpy as np 
import matplotlib.pyplot as plt 

rateList=[0,0.08,.1,.12,.15,.175,.225,.25,.275,.3,.325,.35] 

list1=[-316.8,-424,-2.8,622,658,400,83,16.8,0] 

NPV_Profile1=[np.npv(x,list1) for x in rateList] 

list2=[-496,-760,84,1050.4,658,400,83,16.8,0] 

NPV_Profile2=[np.npv(x,list2) for x in rateList] 

fig, ax = plt.subplots() 
ax.plot(rateList,NPV_Profile1,rateList,NPV_Profile2) 


# set the x-spine 
ax.spines['left'].set_position('zero') 

# turn off the right spine/ticks 
ax.spines['right'].set_color('none') 
ax.yaxis.tick_left() 

# set the y-spine 
ax.spines['bottom'].set_position('zero') 

# turn off the top spine/ticks 
ax.spines['top'].set_color('none') 
ax.xaxis.tick_bottom() 

plt.show() 

出力：