Python 索引错误：索引 2 超出轴 0 的范围，大小为 2
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IndexError: index 2 is out of bounds for axis 0 with size 2
提问by yonexftw
Im trying to solve 3 differential equations,but I keep getting the following error:
我试图解决 3 个微分方程，但我不断收到以下错误：
This is my code:
这是我的代码：
import numpy as np
import matplotlib.pyplot as plt
from scipy.integrate import odeint
T=np.arange(0, 7, 1e-4)
k1=0.92
k2=0.47
k3=0.25
m = 50
def SistemaEqDif(Y,t):
s=Y[0]
b=Y[1]
l=Y[2]
dEdt = -k1*s
dCdt = (k1/(0.05*m))-k2*b
dldt = k2*b-k3*l
return [dEdt, dCdt,dldt]
C0 = 0
E0 = 1
Y0 = [E0, C0]
Y = odeint(SistemaEqDif,Y0,T)
plt.plot(T,Y[:,0],'g')
plt.plot(T,Y[:,1],'r')
plt.plot(T,Y[:,2],'b')
And this is the error:
这是错误：
File "/Users/arihalpern/untitled29.py", line 21, in SistemaEqDif
l=Y[2]
IndexError: index 2 is out of bounds for axis 0 with size 2
回答by
(Answer courtsey of Warren Weckesser, provided in the comments to the question.)
（答案由 Warren Weckesser 提供，在问题的评论中提供。）
You have Y0 = [E0, C0]. If the system is three-dimensional, then Y0must have three values, so something like Y0 = [E0, C0, l0]where l0is the initial condition for l(t).
你有Y0 = [E0, C0]。如果系统是三维的，则Y0必须具有三个值，因此类似于Y0 = [E0, C0, l0]wherel0的初始条件是l(t)。
