How to use lsqlin for best line or ploynormial fitting?

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Tharindu Weerakoon
评论： Tharindu Weerakoon 2015-3-3
I have a set of X and Y data only.
X=[-11 -10 -9 -8 -6 -4 -2 0 1 2 ] Y=[ 3 5 1 4 6 10 12 12 12.5 12]
I want to calculate the best fitting line for the given set of coordinates. How can I use lsqlin to compute the parameters of the equation.
How can I use it for polynomials?

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回答（1 个）

Torsten
Torsten 2015-3-2
Is there any advantage of lsqlin over polyfit you have in mind ?
Best wishes
Torsten.
  1 个评论
Tharindu Weerakoon
Tharindu Weerakoon 2015-3-3
I'm not sure about the advantages of lsqlin. But indeed ployfit can be used with independent variable X to calculate the Yhat for best fitting as far as I know.
If both X and Y are dependent Orthogonal linear regression will give the best solution over the polyfit (for line fitting only I think).
For nonlinear case, to have the best polynomial for given dependent set of X and Y polyfit will give a much easy solution but I don't have any idea about polynomial fitting technique other than fit command.

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