请问，lsqcurvefit拟合后如何显示相关系数R^2？

limopcb

- c. t/ }2 d" B) N2 L  I请问，lsqcurvefit拟合后如何显示相关系数R^2，感谢！
( p* n! a0 j  H- Zclear;clc;
  ]" `# E$ B) |  Q  ]# x- CT=[293.15        298.15        303.15        308.15        313.15];
$ Q- a; ?( A; B& D/ F: J# W6 m3 n/ Oc=[0.000378156        0.000425433        0.000562474        0.000684178        0.000981096];
TT=T';
# ]* X. S& E  {( xcc=c';
x=[TT,cc];
/ q* c  a& z- H* m- H1 K3 Z: p& h$ qHm=33509;
, A, L) S( m6 u& ?6 e/ [9 E/ OTm=408.65;
0 g3 l" @4 O* x" ]8 Ra=0.3;
. }! O" _4 S/ J8 R3 z5 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));
q0=[0,0];
q=lsqcurvefit(fun,q0,x,zeros(size(x,1),1))
1 R' Z7 }8 G" X  U" O- X$ Yplot(x(:,1),x(:,2),'r^');hold on;
ezplot(@(x,c)fun(q,[x,c]),[290,314,0.0003,0.001]);
" D  Q! x4 O0 z" zh=ezplot(@(x,c)fun(q,[x,c]),[290,314,0.0003,0.001]);
' `6 g4 s8 }$ W, y! e' O5 {

Allevi

非线性拟合，R2没有意义的
参考
: z- Z* X( G8 Y; s& s  F  Ostatisticsbyjim.com/regression/r-squared-invalid-nonlinear-regression
blog.minitab.com/blog/adventures-in-statistics-2/why-is-there-no-r-squared-for-nonlinear-regression