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curve_fitting/least_squares.m

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function [a,fx,r2]=least_squares(Z,y)
a = (Z'*Z)\(Z'*y);
%Define function
fx=Z*a;
%Sum equation
Sr = sum((y-Z*a).^2);
%equation for coefficient of determination
r2 = 1-Sr/sum((y-mean(y)).^2);
end