How to reduce polynomial?

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Asked 5 years, 9 months ago

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I have some 4 polynomials like this. these equation is made by polyfit() from MATLAB tool.

eq1) 3.1734x^3 -5.8952x^2 +3.8194x -0.0377
eq2) 2.1489x^3 -3.9026x^2 +2.8169x -0.0160
eq3) 1.0796x^3 -1.9013x^2 +1.8500x +0.0008
eq4) x

then I want to make these 4 polynomials to one polynomial But I don't know how to apply this concept to my 4 polynomials .

Update :

Here is referencing.

Actually, I want to apply above concepts to in my case.

How can I get a (H^T H)^−1 H^Ty from above equations?

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asked Aug 10 '15 at 17:59

gmotree

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$\begingroup$ What is your y and H? Do you want to fit a polynomial to your data y? $\endgroup$ – Oliver Aug 11 '15 at 7:35
$\begingroup$ @Oliver : I am referencing here math.stackexchange.com/questions/1392818/… $\endgroup$ – gmotree Aug 11 '15 at 7:41

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