Exponential CDF

Problem

Exponential cumulative distribution function evaluated at x.

F(x) = 1 - e^(-lam * x) for x >= 0 and 0 otherwise. Return 0.0 for negative lam.

Hint

F(x) is the integral of the density from 0 to x.

case 1

in: [1,1]

expected: 0.6321205588285577

case 2

in: [2,0.5]

expected: 0.6321205588285577

case 3

in: [3,0]

expected: 0

case 4

in: [1,-2]

expected: 0

Starter codePython

import math


def exponential_cdf(lam, x):
    # Your code here
    pass

4 test cases · run your code against them in the editor