I need the algorithm behind polyfit function in Matlab

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AGS
AGS 2012-6-26
Hi, I need the algorithm behind polyfit function of matlab. I have a 3rd order polynomial curve. I need to find a polynomial best fit for the curve. kindly help me with the algorithm n procedure. Reply me to agsagastheesh@gmail.com. Thank you.

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回答（1 个）

Walter Roberson
Walter Roberson 2012-6-26
http://www.mathworks.com/help/techdoc/ref/polyfit.html
Algorithms
The polyfit MATLAB file forms the Vandermonde matrix, V, whose elements are powers of x. v(i,j) = x(i)^(n-j)
It then uses the backslash operator, \, to solve the least squares problem Vp≅y.
You can modify the MATLAB file to use other functions of x as the basis functions.

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