我运行这个python代码来推导公式。 R(x)=50*ln(5x+1)
我试过了numpy.log文件以及数学.log你知道吗
from sympy import Symbol, Derivative
import numpy as np
import math
x= Symbol('x')
function = 50*(math.log(5*x+1))
deriv= Derivative(function, x)
deriv.doit()
我期望得到微分后的方程,但我得到了误差
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-107-e41161e3f329> in <module>()
5 x= Symbol('x')
6
----> 7 function = 50*(math.log(5*x+1))
8
9 deriv= Derivative(function, x)
~/anaconda3/lib/python3.7/site-packages/sympy/core/expr.py in __float__(self)
254 if result.is_number and result.as_real_imag()[1]:
255 raise TypeError("can't convert complex to float")
--> 256 raise TypeError("can't convert expression to float")
257
258 def __complex__(self):
TypeError: can't convert expression to float
不要把
math
和sympy
混在一起。从sympy
使用log
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