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Math Help - parametric equations

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    parametric equations

    I need help with parametric equations....i can't seem to figure out where to start when looking at a problem. The problems i will have to solve include looked at a diagram and figuring out the parametric equations for the trace of a movie point. Any suggestions?
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    Quote Originally Posted by sarah s View Post
    I need help with parametric equations....i can't seem to figure out where to start when looking at a problem. The problems i will have to solve include looked at a diagram and figuring out the parametric equations for the trace of a movie point. Any suggestions?
    Give a problem that you are unable to do.
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    Quote Originally Posted by sarah s View Post
    I need help with parametric equations....i can't seem to figure out where to start when looking at a problem. The problems i will have to solve include looked at a diagram and figuring out the parametric equations for the trace of a movie point. Any suggestions?
    If I am understanding what you have to do correctly the I would suggest the following scheme:

    Set the lower left corner of the screen as (0, 0). Then you can think of your trace as a series of coordinate points. Pick a starting point for your trace and call this t = 0. Call the coordinates of that point (x(0), y(0)).

    Now pick a small distance along the path, small enough that the path is (roughly) a straight line over that distance. Record the coordinates of that point as (x(1), y(1)).

    Using the same distance, find the coordinates of the next point, (x(2), y(2)). etc.

    So you will have a list of coordinate points at "equal spacings" along the trace.

    Now find a best fit function for the x - coordinates, and a separate best fit function for the y - coordinates. This will be your parametric representation of the trace.

    -Dan
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