Robust regression in matlab

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Ede gerlderlands 2012-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/53727-robust-regression-in-matlab

I did robust regression in matlab. The thing is I can't display the correlation coefficient in my graph as (R^2 = ??). Can you help me with that? here is the regression part which am working on.

for ss =1:size(R,2);
         [bls,sts] = robustfit(R(:,ss),f(:,ss));
         scatter(R(:,ss),f(:,ss),'filled'); 
         plot(R(:,ss),bls(1)+bls(2)*R(:,ss))
  end;