Polynomial fitting prob lem
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Hello,
Would anyone have an idea how to prevent these large peaks and troughs occurring at the edges of a polynomial fit?
x = -1:0.005:1;
y = rand(size(x));
polydegree = 15;
coeffs = polyfit(x, y, polydegree);
y = polyval(coeffs,x);
plot(x,y,'k')
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Jan
2013-1-28
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Searching for already published solutions in the net is a good idea, see:
- http://www.mathworks.com/matlabcentral/fileexchange/38926-fit-polynomial-to-data-with-constraints
- http://www.mathworks.com/matlabcentral/fileexchange/35401-polyfitzero
- http://www.mathworks.com/matlabcentral/fileexchange/220-polyfit2
- http://www.mathworks.com/matlabcentral/fileexchange/272-polyfit0-m/content/polyfit0.m
But interpolating polynomials must oscillate at the edges for high orders. Therefore the order should be chosen as low as possible.
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