如何在 Python 中使用 matplotlib 使 x 轴通过 (0,0)？

【问题标题】：How do you make the x-axis pass through (0,0) with matplotlib in Python?如何在 Python 中使用 matplotlib 使 x 轴通过 (0,0)？
【发布时间】：2017-05-17 05:30:28
【问题描述】：

如何让横轴通过原点？

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()

【问题讨论】：

标签： python-3.x matplotlib

【解决方案1】：

尝试：

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()

输出：

【讨论】：