Re: python math problem

Discussion in 'Python' started by Joel Goldstick, Feb 15, 2013.

  1. On Fri, Feb 15, 2013 at 2:39 PM, Kene Meniru <> wrote:

    > I am trying to calculate the coordinates at the end of a line. The length
    > and angle of the line are given and I am using the following formula:
    >
    > x = (math.sin(math.radians(angle)) * length)
    > y = (math.cos(math.radians(angle)) * length)
    >
    > The following are sample answers in the format (x, y) to the given
    > length/angle values of the line:
    >
    > 120/0 = (0.0, 25.0)
    > 120/89 = (24.9961923789, 0.436310160932)
    > 120/90 = (25.0, 1.53075794228e-15)
    >


    This is not a string, it is scientific notion for 1.53... times 10 to the
    -15th power. Because of rounding errors caused by doing floating point
    math on in binary, you get a very small number instead of 0.

    > 120/91 = (24.9961923789, -0.436310160932)
    >
    > Why am I getting a string number instead of the expected answer for 120/90
    > which should be (25.0, 0.0). This happens at all multiples of 90 (i.e. 180
    > and 270)
    >
    > --
    >
    > Kene
    > ::::::::::::::::::
    >
    >
    > --
    > http://mail.python.org/mailman/listinfo/python-list
    >




    --
    Joel Goldstick
    http://joelgoldstick.com
    Joel Goldstick, Feb 15, 2013
    #1
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