AttributeError: 'Add' object has no attribute 'log' Python

Question

I am making a syntax error, some how my syntax is leading python to think I am writing +.log some where?
Please take a look at the code and let me know. Can any one suggest, a function that can be used instead to solve this Algorithm

import numpy as np

import sympy as sp

answer = 0

x = sp.Symbol('x')

y = sp.Symbol('y')

W = sp.Symbol('W')

R = sp.Symbol('R')

a = sp.Symbol('a')

n = sp.Symbol('n')

m = sp.Symbol('m')

O = sp.Symbol('O')

'''
answer = sp.solve(((((-1* (np.log(1+(x/R))))/(np.log(1+((10**6)/R))))+1)*(Os/((np.log(np.exp(1)+(x/a)**n))**m)))-W,x)
'''

answer = sp.solve(((((-1* (sp.log(1+(x/R))))/(sp.log(1+((10**6)/R))))+1)*(O/((sp.log(np.exp(1)+(x/a)**n))**m)))-W,x)

print(answer)

Results: OLD

line 15, in <module>
    answer = sp.solve(((((-1* (np.log(1+(x/R))))/(np.log(1+((10**6)/R))))+1)*(Os/((np.log(np.exp(1)+(x/a)**n))**m)))-W,x)
AttributeError: 'Add' object has no attribute 'log'

Process finished with exit code 1

Results: New

 Continuum\Anaconda3\lib\site-packages\sympy\solvers\solvers.py", line 1414, in _solve
    "\nNo algorithms are implemented to solve equation %s" % f)
NotImplementedError: multiple generators [log((x/a)**n + 54365636569181/20000000000000)**m, log(1 + x/R)]
No algorithms are implemented to solve equation O*(1 - log(1 + x/R)/log(1 + 1000000/R))*log((x/a)**n + 54365636569181/20000000000000)**(-m) - W

Process finished with exit code 1

It seems you are getting confused with the parenthesis. Try to separate them in multiple lines and do step-by-step first — rafaelc
– rafaelc, Commented Apr 24, 2015 at 7:13
Can any one suggest, a function that can be used instead to solve this Algorithm. — SDS
– SDS, Commented Apr 24, 2015 at 8:13

locoyou · Accepted Answer · 2015-04-24 07:26:46Z

2

I think you should use sp.log instead of np.log. I run your code but it seems like the equation is too complex and no algorithms are implemented to solve it.

answered Apr 24, 2015 at 7:26

locoyou

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5 Comments

SDS Over a year ago

I am just trying to solve for x. Can you share more about no algorithms being implemented to solve the equation.

locoyou Over a year ago

@SDS You want to solve a symbol equation, so you need to use log function given by sympy. Change all np.log in your code to sp.log. Usually this works but for your equation, I get an error NotImplementedError: multiple generators [log((x/a)**n + 54365636569181/20000000000000)**m, log(1 + x/R)]. Often this means that the solutions cannot be represented symbolically. See docs.sympy.org/dev/tutorial/solvers.html

SDS Over a year ago

I wasnt sure if sp.log = ln or log10, since I want to use ln.

SDS Over a year ago

Thanks!, I will try to use an alternate syntax to solve the equation.

locoyou Over a year ago

@SDS it is ln. You can accept my answer if it gives a hand :)

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