RRQR factorization

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An RRQR factorization or rank-revealing QR factorization is a matrix decomposition algorithm based on the QR factorization which can be used to determine the rank of a matrix.[1] The SVD can be used to generate an RRQR, but it is not an efficient method to do so.[2] A RRQR implementation is available for MATLAB.[3]

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