Creating a formula from plot points

  1. Hallo all...

    I have a couple of plot values that I am trying to derive a formula from. The points are almost linear but not quite...

    Was hoping someone could shed some light on how to go about this...
    I have Matlab 7.1, would like to use it if at all possible....

    Any help would be appreciated.
  2. jcsd
  3. Simon Bridge

    Simon Bridge 15,474
    Science Advisor
    Homework Helper
    Gold Member

    Welcome to PF;
    Turning a plot into an equation is called regression analysis.
    You have to start out with a good idea of what the underlying equation should be before you start.

    If you only have two points, then you can only plot a line - I'm guessing you mean you have a couple of datasets that, when you graph them, make something that looks like it's trying to be a line.

    The matlab function you want will be: polyfit
    ... you want to find the line y=mx+c that best fits the data.
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