Rank-revealing QR/SVD Decompositions

#1

Are there implementations of rank-revealing QR/SVD decompositions, resp. QR and SVD updating / downdating mechanisms in any Julia package?

See for instance:
[1] Li and Zheng, A Rank-revealing Method with Updating, Downdating and Applications, SIAM J. Matrix Anal. Appl., 2005.
[2] RankRev: a Matlab package for computing the numerical rank and updating/downdating, T.-L. Lin, 2016.

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