Python Simpson's Rule Float object error

Question

I am having problem with the simpsons rule. It is saying float object cannot be interpreted as an integer in for i in range(1, (n/2) + 1):

def simpson(f, a, b, n):
h=(b-a)/n
k=0.0
x= a + h
for i in range(1, (n/2) + 1):
    k += 4*f(x)
    x += 2*h

x = a + 2*h
for i in range(1, n/2):
    k +=2*f(x)
    x += 2*h
return (h/3)*(f(a)+f(b)+k)

result=simpson(lambda x:x, 0, 1, 4) print (result)

Possible duplicate of Python TypeError: 'float' object cannot be interpreted as an integer — Ocaso Protal
– Ocaso Protal, Commented Mar 6, 2017 at 9:14

DeepSpace · Accepted Answer · 2017-03-06 09:09:51Z

0

n / 2 returns a float in Python 3, while range only works with integers. You need to use integer division (//):

range(1, (n // 2) + 1).

answered Mar 6, 2017 at 9:09

DeepSpace

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3 Comments

Pema Chida Sherpa Over a year ago

Ok i will give it a try

Pema Chida Sherpa Over a year ago

It worked thank you. I used the second method. So can you explain me how this first one works. i mean do i have to import any function before using this because when i tried the first function its is saying that the floor function is not defined.

DeepSpace Over a year ago

@PemaChidaSherpa Indeed, in order to use floor you need to import it: from math import floor. I removed it from my answer as it is easier to simply use //.

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