On 03/12/2021 19:22, Swadhin Satapathy wrote:
I got the following error:
File "C:\Users\Admin\.spyder-py3\temp.py", line 22, in <module>
a = newton(p, p_prime,-10, 0)
File "C:\Users\Admin\.spyder-py3\temp.py", line 15, in newton
delta = p(x)/p_prime(x)
TypeError: 'Add' object is not callable
While running the following code:
import numpy as np
import matplotlib.pyplot as plt
import sympy as sym
acc = 1E-10
x = sym.Symbol('x')
def p(x): #define the function
return 924*x**6 - 2772*x**5 + 3150*x**4 - 1680*x**3 + 420*x**2 -
42*x + 1
p_prime = sym.diff(p(x))
print(p_prime)
def newton(p,p_prime, acc, start_val):
x= start_val
delta = p(x)/p_prime(x)
while abs(delta) > acc:
delta = p(x)/p_prime(x)
print(abs(delta))
x =x- delta;
return round(x, acc);
a = newton(p, p_prime,-10, 0)
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Try adding this line immediately before your line 15:
print("p=",p," p_prime=",p_prime)
If you do that, you will see that p is a function - so it is OK to call
it as in p(x),
however p_prime is an expression (an Add object, since it consists of a
number of terms added/subtracted together), so it isn't OK to call it as
in p_prime(x).
Hence your error message!
TypeError: 'Add' object is not callable
That error message is super obscure, it would be good to see it upgraded.
Cheers,
David
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