Does MATLAB qr function employ the SuiteSparseQR (multifrontal multithreaded sparse QR factorization) in SuiteSparse ?

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Cem Gormezano
Cem Gormezano 2020-7-4
I am using the function [Q,R,P] = qr(A,0) to have a rank-revealing qr factorization of sparse matrix A. I am wondering if MATLAB by default employs spqr within SuiteSparse. Furthermore, when A is not full rank, I get zero diagonals in R, how would I employ this property of R to deduce the rank of A.
Thank you !!!

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