Algorithm for R square

Hello,

I wish to know the algorithm which MATLAB uses for determining R^2 in the following expressions?

1. rsq2 = 1 - norm(p1-p)^2 / norm(p1-mean(p1))^2
2. R = corrcoef(p,p1); Rsq = R(1,2).^2

In the above expressions, p respresents the model fitted value and p1 represents the experimental data.

Can anyone let me know whether the default algorithm is Levenberg-Marquardt?

Thanking you in advance.

Answer 1

[Steven Lord]

For the second one, see the "More About" section on the documentation page for the corrcoef function.