How to find the Linear Regression?

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R7 DR
R7 DR 2015-8-3
编辑： R7 DR 2015-8-3
Hi
I fitted the data using the fminsearch. I am able to find the slope and intercept of the fitted equation but, how to find the Linear Regression (R2) value of the fitted equation?
code:
for i=1:3
y=[Y1{i,1}']
x=[X{i,1}']
A= fminsearch(@(par_fit) funccoats(par_fit,x,y),rand(1,2));
B(i,1)=A(:,1)
C(i,1)=A(:,2)
end
graph:

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