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Creating a formula from plot points

by Little_grim
Tags: creating, formula, plot, points
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Oct26-13, 04:07 PM
P: 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.
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Simon Bridge
Oct26-13, 07:20 PM
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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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