请问，lsqcurvefit拟合后如何显示相关系数R^2？

limopcb

2 g/ k* h/ Z0 _5 S: i请问，lsqcurvefit拟合后如何显示相关系数R^2，感谢！
clear;clc;
T=[293.15        298.15        303.15        308.15        313.15];
c=[0.000378156        0.000425433        0.000562474        0.000684178        0.000981096];
6 {; t6 H; `3 t0 C3 b/ _TT=T';
cc=c';
! Z. r6 j- g8 z' d- a& ux=[TT,cc];
Hm=33509;
3 o% J1 k0 o% M6 p! MTm=408.65;
  |" S4 ]6 [7 J) s* |' y+ W. z# `a=0.3;
9 r9 y5 w, D! yfun=@(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));
3 U) S9 R) A$ O& j. ]q0=[0,0];
q=lsqcurvefit(fun,q0,x,zeros(size(x,1),1))
plot(x(:,1),x(:,2),'r^');hold on;
ezplot(@(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
参考
+ g) c/ J' @6 T+ y4 i7 Q. M4 xstatisticsbyjim.com/regression/r-squared-invalid-nonlinear-regression
& \8 T6 Q1 ^0 ]( ]- h6 W6 ublog.minitab.com/blog/adventures-in-statistics-2/why-is-there-no-r-squared-for-nonlinear-regression