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Convert graph to equatio (software)

  1. Jun 5, 2012 #1
    Hi. I'm new to this forum. I would like to ask is there any software that can convert graph to equation. My graph is in xy graph. I need to create a new accurate equation to make data more precisely. Appreciate to anyone who can help.
     
  2. jcsd
  3. Jun 5, 2012 #2
    That's an intractable problem in general. You might try performing regression; any statistics software will do it for you (e.g. MATLAB, R).
     
  4. Jun 5, 2012 #3
    if i have a set of data that able to draw graph, can i apply the data to generate the equation?
     
  5. Jun 5, 2012 #4

    jhae2.718

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    If you have the xy data you can fit a function to it. If you have MATLAB I'd use the Curve Fitting Toolbox, cftool. It offers a nice GUI showing the data set and the fit, and offers several basis functions to choose from.
     
  6. Jun 5, 2012 #5
    If you don't have matlab, Microsoft Excel can also do some basic regressions/curve fitting.
     
  7. Jun 5, 2012 #6
    Btw, how to call that function out from microsoft excel after ploting the graph?
     
  8. Jun 6, 2012 #7

    jhae2.718

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    There's a built-in Excel function that will give you the weights for a fitted basis function; I don't remember what it is.
     
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