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hanmei98232木蟲 (小有名氣)
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[求助]
求助 我自己仿照其他帖子寫了個分段函數(shù)非線性擬合的程序一直出錯 求高手! 已有1人參與
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clear tic fun1=inline('-((beta(1)*x)/(beta(2)*x+1)).*8.314*298.15*(log(x)-0.784*(1.7321*x.^0.5/(1+2.0785*x.^0.5)+1.6667*log(1+2.0785*x.^0.5))+2.6667*x.*(beta(3)+beta(4)*(1+(-1-3.464*x.^0.5+6*x).*exp(-3.464*x.^0.5))/(12*x))+2.8289*x.^2*beta(5))+0.07214','beta','x'); fun2=inline('((beta(1)*x)/(beta(2)*x+1)).*8.314*298.15*(log(x)-0.784*(1.7321*x.^0.5/(1+2.0785*x.^0.5)+1.6667*log(1+2.0785*x.^0.5))+2.6667*x.*(beta(3)+beta(4)*(1+(-1-3.464*x.^0.5+6*x).*exp(-3.464*x.^0.5))/(12*x))+2.8289*x.^2*beta(5))+0.07214','beta','x'); fun=@(beta,x)((x<1).*fun1(beta,x)+(x>=1).*fun2(beta,x)); x=[0.19727 0.39798 0.60182 0.8034 0.98454 1.78733 2.05406 2.51801 3.16362 3.69954 4.5584 ]; y=[0.07282919 0.07366338 0.07454467 0.07522262 0.07593838 0.07919294 0.08033517 0.08203459 0.08494242 0.0867815 0.09083547]; beta=nlinfit(x,y,fun,[0.1,0.2,0.1,0.1,0]); m=beta(1); n=beta(2); a=beta(3); b=beta(4); c=beta(5); warning off all y1=-((beta(1)*x)/(beta(2)*x+1)).*8.314*298.15*(log(x)-0.784*(1.7321*x.^0.5/(1+2.0785*x.^0.5)+1.6667*log(1+2.0785*x.^0.5))+2.6667*x.*(beta(3)+beta(4)*(1+(-1-3.464*x.^0.5+6*x).*exp(-3.464*x.^0.5))/(12*x))+2.8289*x.^2*beta(5))+0.07214; y2=((beta(1)*x)/(beta(2)*x+1)).*8.314*298.15*(log(x)-0.784*(1.7321*x.^0.5/(1+2.0785*x.^0.5)+1.6667*log(1+2.0785*x.^0.5))+2.6667*x.*(beta(3)+beta(4)*(1+(-1-3.464*x.^0.5+6*x).*exp(-3.464*x.^0.5))/(12*x))+2.8289*x.^2*beta(5))+0.07214; yfit(1:5)=y1; yfit(6:11)=y2; plot(x,y,'*') hold on; plot(x,yfit,'r-') toc 求助 我自己仿照其他帖子寫了個分段函數(shù)非線性擬合的程序一直出錯 求高手!新手 剛剛接觸 非常感謝 |
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