我对Python很陌生，所以这可能是一个非常基本的问题。我收到了错误
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
在我的以下代码中：
import numpy as np
import matplotlib.pyplot as plt
import sympy as sp
from sympy import *
%matplotlib inline
x = y = z = np.linspace (0, 5)
#Define Integrals
P = 67.6*(np.sqrt (0.3*((1+z)**3)) + 0.7)
import scipy.integrate as integrate
from scipy.integrate import quad
A = quad(lambda x: ((1+x)*((P)**-3)), z, sp.oo)
B = quad(lambda y: ((1+y)*((P)**-3)), 0, sp.oo)
D = (P/67.6)*(a/b)
plt.plot(z, D, 'r')
plt.xlabel ('$z$'); plt.ylabel ('$D_+$')
plt.savefig('LinearGrowthFactor.png',dpi = 400)
我已经搜索了一段时间的答案，但我还没有发现任何我能理解并实际应用于我的代码的内容。错误出现在该行
上A = quad(lambda x: ((1+x)*((P)**-3)), z, sp.oo)
因此同样的错误也可能出现在下面的行中。
编辑： 这是我收到的完整错误。
ValueError Traceback (most recent call last)
<ipython-input-90-94d843ab23dd> in <module>()
13 from scipy.integrate import quad
14
---> 15 A = quad(lambda x: ((1+x)*((P)**-3)), z, sp.oo)
16 B = quad(lambda y: ((1+y)*((P)**-3)), 0, sp.oo)
17
/Applications/anaconda/lib/python3.5/site-packages/scipy/integrate/quadpack.py in quad(func, a, b, args, full_output, epsabs, epsrel, limit, points, weight, wvar, wopts, maxp1, limlst)
314 if (weight is None):
315 retval = _quad(func, a, b, args, full_output, epsabs, epsrel, limit,
--> 316 points)
317 else:
318 retval = _quad_weight(func, a, b, args, full_output, epsabs, epsrel,
/Applications/anaconda/lib/python3.5/site-packages/scipy/integrate/quadpack.py in _quad(func, a, b, args, full_output, epsabs, epsrel, limit, points)
363 def _quad(func,a,b,args,full_output,epsabs,epsrel,limit,points):
364 infbounds = 0
--> 365 if (b != Inf and a != -Inf):
366 pass # standard integration
367 elif (b == Inf and a != -Inf):
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()