Re: C for Polynomial Fit
- From: Spehro Pefhany <speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 28 Dec 2007 23:39:05 -0500
On Fri, 28 Dec 2007 21:35:47 -0600, the renowned Gary Pace
<xxx@xxxxxxx> wrote:
Howdy :
Does anybody know where I can find code for a C function to fit an
(N-1)th order polynomial to N (x,y) data points. Actually I need to fit
a 5th order polynomial to 11 x,y points.
Thanks folks,
Gary
Since you have fewer terms in the polynomial than data points, you
will need to define what is an optimum fit. One popular (but certainly
not the only) criterion is to minimize the sum of the error squared at
each data point. It's easy to compute (derivative == 0 at minima).
http://mathworld.wolfram.com/LeastSquaresFittingPolynomial.html
In real applications you may actually wish to minimize the maximum
abs. value of error at all data points.
Best regards,
Spehro Pefhany
--
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- C for Polynomial Fit
- From: Gary Pace
- C for Polynomial Fit
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