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I was wondering if it is possible to create a function f(x) in matlab based on y values.

Example X=[0,1,2,3,4,5,6,7,8,9] Y=[5,6,7,8,9,10,11,12,13,14]

In this trivial example I wish to get f(x)=x+5

If my memory serves me well, I remember that maple provide such capability. Wonder if this can be done in matlab?

Thanks

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You'll want to look into polyfit() and polyval(). –  J. M. Oct 6 '11 at 14:17
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(If you're just trying to find a fit for some data, not necessarily in Matlab, try zunzun.com/FunctionFinder/2 ) –  endolith Oct 7 '11 at 14:19
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1 Answer 1

up vote 2 down vote accepted

polyfit(X,Y,n) will give you the coefficients of n'th degree polynomial that fits best to your data (in SSE sense). For your example:

 >> X=[0,1,2,3,4,5,6,7,8,9];
 >> Y=[5,6,7,8,9,10,11,12,13,14];
 >> polyfit(X,Y,1)

ans =

    1.0000    5.0000
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