Fit and Polyfit (LAR vs. Least squares)

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sks 2013-7-4

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I am trying to better understand the difference between fit and polyfit. Am I right to think that fit for polynomials still uses the least absolute residual robust (LAR) method rather than the least squares method (polyfit)?

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Guru 2013-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/81143-fit-and-polyfit-lar-vs-least-squares#answer_90859

在 MATLAB Online 中打开

You can find out by asking for the output argument:

[fitobject,gof,output] = fit(x,y,fitType)
output.algorithm

But the real difference between fit and polyfit are the options that you can choose as well as polyfit is strictly limited to polynomials and uses the least squares method.