Creating a formula from plot points

AI Thread Summary
To create a formula from nearly linear plot points, regression analysis is recommended. It's essential to have a preliminary idea of the underlying equation before starting the analysis. If only two points are available, only a linear relationship can be established. For datasets that resemble a line, the MATLAB function "polyfit" can be used to find the best-fitting line in the form y=mx+c. Utilizing these methods will help derive the desired equation from the plot data.
Little_grim
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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.
 
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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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