<p>我试着在同一个图上画几个随机生成的线图</p>
<p><code>def SnSim(S)</code>函数生成随机数并打印它们，但是当我在下面的<code>for loop</code>中多次调用<code>SnSim(S)</code>函数时，每个随机数都出现在不同的打印窗口中</p>
<p>有没有办法把三条线的图放在同一个图上(下面的代码运行，只需按原样剪切和粘贴即可。谢谢你</p>
<pre><code>import math
import random
import matplotlib.pyplot as plt
steps=10 #how many random numbers to generate per line graphed
z=random.random()
So=100
Strike=105
N=3 #how many times to call the SnSim(S) function.
def Sn(S): return S*(1+z)
def SnSim(S):
listSi = []
listr = list(range(0,steps))
Si=Sn(S)
for i in range (0,steps):
z=random.random()
Si=Si + Si*z
listSi.append(float(Si))
plt.plot(listr,listSi)
plt.show()
print(listSi)
return(Si)
sum=0
for a in range (0,N):
z=random.random()
sum=sum + max((SnSim(So)-Strike),0)
</code></pre>
