如何用MATLAB拟合曲线来求参数?

令x＝(cos(k)。/sin(k))。/c,这个就是xdata向量y=252/(2。016129032*10^9)*a*x^b取log得到log(y)=b*log(x)+log(252/(2。016129032*10^9)*a)所以log(y)与log(x)是线性关系,用p=polyfit(log(xdata),log(y),1)求出b=p(1);a=exp(p(2))/252*(2。016129032*10^9); % 因为log(252/(2。016129032*10^9)*a)=p(2)所以最终程序是如下：clear allc=[2。7,2。8,2。9,3,3。1,3。2,3。45,3。7,3。95,4。2,4。45,4。7,4。95,5。2];k=[0,47,93,140,186,279,372,465,558,651]; y=[18。98,27。35,34。86,38。52,38。44,37。73,38。43,43。87,42。77,46。22];xdata=(cos(k)。/sin(k))。/c;p=polyfit(log(xdata),log(y),1);b=p(1);a=exp(p(2))/252*(2。016129032*10^9);