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%Ö»¿¼ÂÇÏßÐÔÄâºÏ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %ÔʼÊý¾Ý t = [0 .3 .8 1.1 1.6 2.3]'; y = [0.5 0.82 1.14 1.25 1.35 1.40]'; %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %¶àÏîʽÄâºÏ p=polyfit(t,y,2) %ÀûÓÃ×ó³ý X = [ones(size(t)) t t.^2]; a = X\y %regressº¯Êý X = [ones(size(t)) t t.^2]; b=regress(y,X) %lsqcurvefitº¯Êý fun=inline('x(1)*t.^2+x(2)*t+x(3)','x','t'); x=lsqcurvefit(fun,[0,0,0],t,y) %Curve Fitting Toolbox fit1= fit(t,y,'poly2') %Curve Fitting Toolbox(×Ô¶¨Òå¶àÏîʽ) mymodel = fittype('a*t^2+b*t+c','independent','t'); %mymodel = fittype('a*x^2+b*x+c'); fit1= fit(t,y,mymodel,'start',[0,0,0]) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %Ö¸ÊýÐÎʽµÄÄâºÏ X = [ones(size(t)) exp(-t) t.*exp(-t)]; a = X\y %lsqcurvefitº¯Êý fun=inline('x(1)+x(2)*exp(-t)+x(3).*t.*exp(-t)','x','t'); x=lsqcurvefit(fun,[0,0,0],t,y) %Curve Fitting Toolbox mymodel = fittype('a+b*exp(-t)+c*t*exp(-t)','independent','t'); %mymodel = fittype('a+b*exp(-x)+c*x*exp(-x)'); fit1= fit(t,y,mymodel,'start',[0,0,0]) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %²»º¬³£ÊýÏîµÄ¶àÏîʽÄâºÏ %ÀûÓÃ×ó³ý X = [t t.^2]; a = X\y %regressº¯Êý X = [t t.^2]; b=regress(y,X) %lsqcurvefitº¯Êý fun=inline('x(1)*t.^2+x(2)*t','x','t'); x=lsqcurvefit(fun,[0,0],t,y) %Curve Fitting Toolbox mymodel = fittype('a*t^2+b*t','independent','t'); %mymodel = fittype('a*x^2+b*x'); fit1= fit(t,y,mymodel,'start',[0,0]) |
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csfn(½ð±Ò+2,VIP+0):many thanks, ÐÁ¿àÁË
csfn(½ð±Ò+2,VIP+0):many thanks, ÐÁ¿àÁË
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2Â¥2008-11-27 09:20:20
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4Â¥2008-11-28 10:01:38
dnp
ÈÙÓþ°æÖ÷ (ÖªÃû×÷¼Ò)
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5Â¥2008-11-28 10:09:18














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