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How to obtain an equation for this grapgh?

  1. Jul 19, 2009 #1
    1. The problem statement, all variables and given/known data
    i am doing my Honor project and i have obtained a graph like the picture below,now i must give an equation for this graph,any ideas how i can obtain an equation which is compatible with this graph?
    thanks
     

    Attached Files:

  2. jcsd
  3. Jul 19, 2009 #2
    i have an idea about this,it seems they are like Cosine functions with different amplitudes,but what can be an equation for it?
     
  4. Jul 19, 2009 #3

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    Possibly. It might, for example, be y= aebxcos(cx). See if you can find a, b, and c by letting x and y be coordinates of three points on your graph. And then, check to see if they work for other points on the graph.
     
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