def coord_for(n, a=0, b=1):
    """Function that takes 3 parameters or arguments, listed above, and returns a list of the interval division             coordinates."""
    a=float(a)
    b=float(b)
    coords = []
    inc = (b-a)/ n
    for x in range(n+1):
        coords.append(a+inc*x)
    return coords