这个方程怎么用matlab来求系数方程是：y=a*x/(b+x+x*x/c),现在知道8组x和y的数

这个方程怎么用matlab来求系数方程是：y=a*x/(b+x+x*x/c),现在知道8组x和y的数

在Matlab下输入：edit,然后将下面两行百分号之间的内容,复制进去,保存 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% function y=zhidao_fit_87802039(abc,x) %其中a,b,c分别用abc(1),abc(2),abc(3)代替 a=abc(1); b=abc(2); c=abc(3); y=a*x./(b+x+x.^2/c); %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 返回Matlab主界面输入:x=[48.65 47.1 44.9 42 36 28.5 17.4 0]; y=[0.027 0.017 0.019 0.02675 0.0328 0.03883 0.05228 0.08338]; [A,r,j]=nlinfit(x,y,'zhidao_fit_87802039',ones(1,3)); A yy=zhidao_fit_87802039(A,x); plot(x,y,'r*',x,yy) %结果并不是很好.======以下答案可供参考======供参考答案1:这么多的参数供参考答案2:直接用cftool命令，用这个方程作为拟合方程拟合就可以得到系数a，b，c了

感谢回答