Integrating equation using scipy

Question

from scipy.integrate import quad

def integrand(a, b):
    return a * x ** 2 + b

a = 2
b = 1

I = quad(integrand, 0, 1, args=(a,b))
I

This is my program. When I tried to run it, it was showing error :

integrand () takes 2 positional arguments but 3 were given ....

I didn't understand why it is asking for 3 arguments when there are only two variables, i.e. a and b.

Can anyone help me? Can anyone clarify my doubts?

Answer 1

Just replace

def integrand(a, b):

by

def integrand(x, a, b):

The problem is that in the function, you use a variable x but you do not pass the variable x as an argument to the function. 0 and 1 acts as the limits of the integral but since you are integrating w.r.t. x, you get this error.

Output

(1.6666666666666667, 1.8503717077085944e-14)