如何求拟合函数的导数,并求极值点?。
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用以下代码得出的拟合函数类型是cfit类型,而不是diff要求的f句柄,如何进行转化并求极值点?
ftype=fittype('fourier4');
fopt=fitoptions('Method','NonlinearLeastSquares');
[fresult,gof]=fit(X,Y1,ftype,fopt);%%fresult为拟合函数

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