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Creating a formula from plot points 
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#1
Oct2613, 04:07 PM

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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
Oct2613, 07:20 PM

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P: 12,739

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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