ex1129.m

matlab科学计算继续上传

%ex1129.m 非线性最小二乘法拟合曲线
clear all
x=[8.00 8.00 10.00 10.00 10.00 10.00 12.00 12.00 12.00 14.00 14.00 14.00 16.00 16.00 16.00 18.00 18.00 20.00 20.00 20.00 20.00 22.00 22.00 24.00 24.00 24.00 26.00 26.00 26.00 28.00 28.00 30.00 30.00 30.00 32.00 32.0 34.00 36.00 36.00 38.00 38.00 40.00 42.00]';
y=[0.49 0.49 0.48 0.47 0.48 0.47 0.46 0.46 0.45 0.43 0.45 0.43 0.43 0.44 0.43 0.43 0.46 0.42 0.42 0.43 0.41 0.41 0.40 0.42 0.40 0.40 0.41 0.40 0.41 0.41 0.40 0.40 0.40 0.38 0.41 0.40 0.40 0.41 0.38 0.40 0.40 0.39 0.39]'; 
beta0=[0.30 0.02]; %系数初值
[beta,r,j]=nlinfit(x,y,@funex1129,beta0); %系数最小二乘估计值为beta
beta
ci=nlparci(beta,r,j)   %求95％置信区间
nlintool(x,y,@funex1129,beta0,0.05,'生产时间x','氯气级分y') %显示拟合结果和置信区间