具体参数设置参考官网：/help/stats/nlinfit.html?s_tid=srchtitle#btldemp-2
如下所示自定义公式为：y=b1*x1/(b2+x1)+b3*x2/(b4+x2)+b5*x3/(b6+x3)+b7*x4/(b8+x4);
x为n行4列的矩阵，y为n行1列的矩阵；
modelfun = @(beta,x)(beta(1).*x(:,1)./(beta(2)+x(:,1))+beta(3).*x(:,2)./(beta(4)+x(:,2))+beta(5).*x(:,3)./(beta(6)+x(:,3))+beta(7).*x(:,4)./(beta(8)+x(:,4)));rng('default') % for reproducibilityopts = statset('nlinfit');opts.RobustWgtFun = 'bisquare';beta0 = [2;2;2;2;2;2;2;2];初始beta值的设定[beta,R,J,CovB,MSE,ErrorModelInfo]= nlinfit(x,y,modelfun,beta0,opts)yuce_y=modelfun(beta,x)%依据自定义公式预测的y值
