请问，lsqcurvefit拟合后如何显示相关系数R^2？

limopcb

7 C7 Q, D+ ^4 G6 A$ L请问，lsqcurvefit拟合后如何显示相关系数R^2，感谢！
) b2 \% R$ ^; z, o8 Uclear;clc;
T=[293.15        298.15        303.15        308.15        313.15];
9 B- G& J( h* o+ z% M; E7 Sc=[0.000378156        0.000425433        0.000562474        0.000684178        0.000981096];
TT=T';
  a5 u$ }' P1 Vcc=c';
+ U: X( }4 B5 ~+ S. Ox=[TT,cc];
Hm=33509;
! b- e2 \& a7 x6 ?Tm=408.65;
a=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));
' J6 U( a+ B( q  ?  ?q0=[0,0];
  B" g; I& ?5 l4 R4 g* Gq=lsqcurvefit(fun,q0,x,zeros(size(x,1),1))
7 k4 P4 e& m1 `2 M2 H8 Lplot(x(:,1),x(:,2),'r^');hold on;
ezplot(@(x,c)fun(q,[x,c]),[290,314,0.0003,0.001]);
. e' P, z7 R( {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
参考
. A5 E6 i' p; N( cstatisticsbyjim.com/regression/r-squared-invalid-nonlinear-regression
% I5 L1 e9 f& `blog.minitab.com/blog/adventures-in-statistics-2/why-is-there-no-r-squared-for-nonlinear-regression