how can I solve this question? I need help

[Star Strider]

See: coefficients of the polynomial - the least squares method

[ahmet emin arslan]

Thanks ❤❤

Answer 1

[Stephan]

Have a read here:

https://de.mathworks.com/help/matlab/ref/polyfit.html

Best regards

Stephan

[ahmet emin arslan]

I saw this answer but I couldnot solve it

[ahmet emin arslan]

Page*

[Walter Roberson]

polyfit uses Vandermonde matrix to do the calculation, not least squares.

You require an 8th order polynomial and you have 9 input points. There are exact solutions for the fit (to within round-off) using techniques such as lagrange interpolating polynomial. Least squares is not one of those exact solution techniques, not unless you are using it in a degenerate sense.

I have to wonder, then, whether the question is expecting you to use curve fitting, or expecting you to construct a sum-of-squares residue function and minimize that function ?

[ahmet emin arslan]

I should ask to teacher but I think it's expecting to use curve fitting

[Walter Roberson]

fittype('poly8')