[x, ind] = OLS(A,b,r) gives the solution to the least squares problem
using only the best r regressors chosen from the ones present in matrix A.
This function also returns in the vector ind the indexes of the
best r regressors (i.e., the best columns of A to use).
Marco Cococcioni (2021). OLS (https://www.mathworks.com/matlabcentral/fileexchange/15902-ols), MATLAB Central File Exchange. Retrieved .
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