Parabolic regression problem

2011 8 21
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how do you find a b and c in parabolic regression? like in this expression: y= -0.20x^2 + 1.94x + 2.78, how do you get 0.20 1.94 and 2.78??

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bym
bym 2011-8-21

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A = [ones(size(x)), x, x.^2];
abc = A\y;

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Dwyane Wade
Dwyane Wade 2011-8-21
do you know how to get it in real linear algebra? I mean manually? Without using matlab. I kinda need to know how to...
Jan
Jan 2011-8-21
@Francis: The method to do this manually is exactly the same as proecsm's solution. You have top solve the same system of equations, but manually.
Dwyane Wade
Dwyane Wade 2011-8-22
what does ones and size mean then?
Jan
Jan 2011-8-22
@Francis: Please read the Getting Started chapters in the documentation for such basic questions. "help size" and "help ones" are helpful also, as for all other MATLAB commands.

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