请问，lsqcurvefit拟合后如何显示相关系数R^2？

limopcb

0 g) x6 Q& k' A5 q请问，lsqcurvefit拟合后如何显示相关系数R^2，感谢！
3 ~- |: }1 x+ k+ gclear;clc;
* N* b% B( o! P9 e4 ]% _$ x5 kT=[293.15        298.15        303.15        308.15        313.15];
2 S4 ]2 d4 H  {- B6 p+ p/ Vc=[0.000378156        0.000425433        0.000562474        0.000684178        0.000981096];
- U" C5 l& r( E) zTT=T';
: \5 U+ c9 k) N: f( xcc=c';
x=[TT,cc];
% X) _/ p, B: X: \% U. [, {, cHm=33509;
: m2 K) v/ i/ s: u+ p, w4 gTm=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));
2 Y1 c" m3 @; \" Rq0=[0,0];
q=lsqcurvefit(fun,q0,x,zeros(size(x,1),1))
0 K, z1 `; q" J# S$ Y( A+ _/ lplot(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
9 i6 A, j3 B4 k& C参考
4 @8 I* U# e' J, ]statisticsbyjim.com/regression/r-squared-invalid-nonlinear-regression
. j7 |( g4 y8 u4 F# L3 yblog.minitab.com/blog/adventures-in-statistics-2/why-is-there-no-r-squared-for-nonlinear-regression