Load the data stored in the file synthdata.mat. Fit a fourth-order polynomial function (-f(x ; mathbf{w})=w_{0}+w_{1} x+w_{2}

Question:

Load the data stored in the file synthdata.mat. Fit a fourth-order polynomial function $-f(x ; \mathbf{w})=w_{0}+w_{1} x+w_{2} x^{2}+w_{3} x^{3}+w_{4} x^{4}-$ to this data. What do you notice about $w_{2}$ and $w_{4}$ ? Use 10 -fold cross-validation to choose the polynomial order (between 1 and 4).

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