请问，lsqcurvefit拟合后如何显示相关系数R^2？

limopcb

请问，lsqcurvefit拟合后如何显示相关系数R^2，感谢！
9 w+ T; @7 k) p9 V2 N9 g" m& Uclear;clc;
: F) c$ l. @1 c+ V% f3 p/ `T=[293.15        298.15        303.15        308.15        313.15];
c=[0.000378156        0.000425433        0.000562474        0.000684178        0.000981096];
TT=T';
cc=c';
x=[TT,cc];
Hm=33509;
! W" [" I" S) ~  N4 DTm=408.65;
+ f5 t# r" p( Xa=0.3;
fun=@(q,x)(-Hm.*(x(:,1)./Tm-1)./(8.314.*x(:,1))+log(x(:,2))+(1-x(:,2)).^2.*((q(1)./(8.314.*x(:,1))).*(exp(-a.*q(1)./(8.314.*x(:,1)))./(x(:,2)+(1-x(:,2)).*exp(-a.*q(1)./(8.314.*x(:,1))))).^2+(q(2)./(8.314.*x(:,1))).*exp(-a.*q(2)./(8.314.*x(:,1)))./(1-x(:,2)+x(:,2).*exp(-a.*q(2)./(8.314.*x(:,1)))).^2));
q0=[0,0];
$ |/ i+ F4 y' g' l7 _: i- tq=lsqcurvefit(fun,q0,x,zeros(size(x,1),1))
4 X: O+ V8 c/ M& ]5 D1 c& h$ Splot(x(:,1),x(:,2),'r^');hold on;
4 H# Z7 q7 K  I2 Kezplot(@(x,c)fun(q,[x,c]),[290,314,0.0003,0.001]);
, g" _0 k, S3 P  H5 l9 \h=ezplot(@(x,c)fun(q,[x,c]),[290,314,0.0003,0.001]);

Allevi

非线性拟合，R2没有意义的
3 `) P/ i+ l6 X) b( n参考
statisticsbyjim.com/regression/r-squared-invalid-nonlinear-regression
( p3 _& J' ]4 @  Z6 i( E" ]blog.minitab.com/blog/adventures-in-statistics-2/why-is-there-no-r-squared-for-nonlinear-regression