derivative of Newton-raphson

[Viktor Sundelin]

Hello!
I can't get this code to work, what is wrong?


If I type:

>>>derivative(math.sin, math.pi, 0.0001)

Shouldn't I get a value in return?
This is the error massage:

TypeError: 'float' object is not callable

This is the function definition: ->

def derivative (f,x,h):
    import math
    return float(1/(2*h)) * (f(x+h) - f(x-h))

[bvdet]

I think you assigned the identifier float to a real number, effectively masking built-in function float(). There is no need to type cast your calculation to float as long as one of the values is a float.

import math

def derivative (f,x,h):
    return 1.0/(2*h) * (f(x+h) - f(x-h))

print derivative(math.sin, math.pi, 0.0001)