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function [V,beta,p,R,q] = cs_qr (A) %#ok
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function [V,beta,p,R,q] = cs_qr (A) %#ok
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%CS_QR sparse QR factorization (Householder-based).
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% [V,beta,p,R] = cs_qr(A) computes the QR factorization of A(p,:).
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% [V,beta,p,R,q] = cs_qr(A) computes the QR factorization of A(p,q).