matlab非线性回归

function test() clear all;clc; D=[23.0 22.0 31.9 0.1674 0.0280; 23.5 22.5 32.20 0.1690 0.0286; 24.0 23.0 32.5 0.1706 0.0288; 24.5 23.5 32.65 0.1714 0.0291; 25.0 24.0 32.80 0.1722 0.0296; 25.5 23.0 32.90 0.1727 0.0298]; T=D(:,1); %温度T我仅采用了导体温度 II=D(:,5); beta=ones(7,1); beta = nlinfit(T,II,@mymodel,beta); %答案：b1=beta(1) b2=beta(2) b3=beta(3) b4=beta(4) b5=beta(5) b6=beta(6) b7=beta(7) %验证：II_p=mymodel(beta,T) %验证 end function yhat = mymodel(beta,T) yhat = (beta(1)*T.^4 + beta(2)*T.^3 + beta(3)*T.^2 + beta(4)*T + beta(5))./(beta(6)*T+beta(7)); end