assignment-for-edX-course-Introduction-to-Computer-Science-and-Programming-Using-Python/radiationExposure.py at master · wangluyi/assignment-for-edX-course-Introduction-to-Computer-Science-and-Programming-Using-Python · GitHub

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def f(x):
    import math
    return 400*math.e**(math.log(0.5)/3.66 * x)

def radiationExposure(start, stop, step):
    '''
    Computes and returns the amount of radiation exposed
    to between the start and stop times. Calls the
    function f (defined for you in the grading script)
    to obtain the value of the function at any point.

    start: integer, the time at which exposure begins
    stop: integer, the time at which exposure ends
    step: float, the width of each rectangle. You can assume that
      the step size will always partition the space evenly.

    returns: float, the amount of radiation exposed to
      between start and stop times.
    '''
    # FILL IN YOUR CODE HERE...
    x_now=start
    area=0
    while 1:
        if x_now>=stop:
            return area
        area+=f(x_now)*step
        x_now+=step