请问，lsqcurvefit拟合后如何显示相关系数R^2？

limopcb

2 ^+ ]% p* v7 s1 f; t请问，lsqcurvefit拟合后如何显示相关系数R^2，感谢！
clear;clc;
% @$ O% o' h3 \9 I, u* {T=[293.15        298.15        303.15        308.15        313.15];
c=[0.000378156        0.000425433        0.000562474        0.000684178        0.000981096];
TT=T';
7 ]$ K+ ?2 Q3 D3 L. C. |2 Ucc=c';
9 R  }0 E8 {9 L7 k. [x=[TT,cc];
Hm=33509;
3 G% c. M& y4 u" M6 B; V$ r$ Z4 I0 _* uTm=408.65;
a=0.3;
! P" s) M( ?; }- I9 a( }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));
# s8 w  m( s) t$ C  h! c7 ?  ?q0=[0,0];
q=lsqcurvefit(fun,q0,x,zeros(size(x,1),1))
( Y' |0 H$ X$ z/ P; Jplot(x(:,1),x(:,2),'r^');hold on;
4 @( m0 Q0 Y) w9 wezplot(@(x,c)fun(q,[x,c]),[290,314,0.0003,0.001]);
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
* g, k& |, Q" \参考
9 z- t1 u- \) y7 J9 ?! Rstatisticsbyjim.com/regression/r-squared-invalid-nonlinear-regression
5 I3 n9 m* r/ mblog.minitab.com/blog/adventures-in-statistics-2/why-is-there-no-r-squared-for-nonlinear-regression