Journal Article 2 sparse matrix Algorithms 1 Chebyshev semi-iterative method 1 Krylov subspace method 1 LAPACK 1 LSQR 1 mehr ... Lanczos process 1 Tikhonov regularization 1 conjugate-gradient method 1 data encapsulation 1 ill-posed problem 1 iterative method 1 linear equations 1 linear least squares 1 minimum-length solution 1 minimum-residual method 1 over determined system 1 parallel computing 1 preconditioning 1 pseudoinverse solution 1 random matrix 1 random projection 1 random sampling 1 randomized algorithm 1 rank-deficient 1 regression 1 ridge regression 1 singular least-squares 1 underdetermined system 1 weniger ...