Nicola, Aurelian; Petra, Stefania; Popa, Constantin; Schnörr, Christoph A general extending and constraining procedure for linear iterative methods. (English) Zbl 1256.65027 Int. J. Comput. Math. 89, No. 2, 231-253 (2012). Reviewer: Murli Gupta (Washington, D. C.) MSC: 65F10 65F22 65D18 94A08 × Cite Format Result Cite Review PDF Full Text: DOI Link
Popa, Constantin Iterative solvers for Tikhonov regularization of dense inverse problems. (English) Zbl 1223.65029 Int. J. Comput. Math. 87, No. 14, 3199-3208 (2010). Reviewer: Michael Jung (Dresden) MSC: 65F22 65F10 65F20 45B05 65R20 × Cite Format Result Cite Review PDF Full Text: DOI
Mohr, M.; Popa, C. Numerical solution of symmetric least-squares problems with an inversion-free Kovarik-type algorithm. (English) Zbl 1152.65046 Int. J. Comput. Math. 85, No. 2, 271-286 (2008). Reviewer: Tzvetan Semerdjiev (Sofia) MSC: 65F10 65F20 × Cite Format Result Cite Review PDF Full Text: DOI
Petcu, D.; Popa, C. A new version of Kovarik’s approximate orthogonalization algorithm without matrix inversion. (English) Zbl 1085.65038 Int. J. Comput. Math. 82, No. 10, 1235-1246 (2005). Reviewer: Liu Xinguo (Qingdao) MSC: 65F25 × Cite Format Result Cite Review PDF Full Text: DOI
Mohr, M.; Popa, C.; Rüde, U. An iterative algorithm for approximate orthogonalisation of symmetric matrices. (English) Zbl 1053.65029 Int. J. Comput. Math. 81, No. 2, 215-226 (2004). Reviewer: Daniel Kressner (Berlin) MSC: 65F25 65F20 15A09 × Cite Format Result Cite Review PDF Full Text: DOI
Popa, Constantin Modified Kovarik algorithm for approximate orthogonalization of arbitrary matrices. (English) Zbl 1022.65045 Int. J. Comput. Math. 80, No. 4, 519-525 (2003). MSC: 65F25 65F10 × Cite Format Result Cite Review PDF Full Text: DOI
Evans, David J.; Popa, Constantin Projections and preconditioning for inconsistent least-squares problems. (English) Zbl 1005.65037 Int. J. Comput. Math. 78, No. 4, 599-616 (2001). Reviewer: Petko Hr.Petkov (Sofia) MSC: 65F20 45B05 65R20 65R30 65F35 × Cite Format Result Cite Review PDF Full Text: DOI
Popa, Constantin A method for improving orthogonality of rows and columns of matrices. (English) Zbl 1005.65039 Int. J. Comput. Math. 77, No. 3, 469-480 (2001). Reviewer: Thomas Sonar (Braunschweig) MSC: 65F25 × Cite Format Result Cite Review PDF Full Text: DOI
Popa, Constantin Mesh independence principle for nonlinear equations on Hilbert spaces by preconditioning. (English) Zbl 0932.65063 Int. J. Comput. Math. 69, No. 3-4, 295-318 (1998). Reviewer: E.Emmrich (Berlin) MSC: 65J15 65N22 35J65 47J25 × Cite Format Result Cite Review PDF Full Text: DOI
Popa, Constantin Preconditioning conjugate gradient method for nonsymmetric systems. (English) Zbl 0846.65010 Int. J. Comput. Math. 58, No. 1-2, 117-133 (1995). Reviewer: F.Szidarovszky (Tucson) MSC: 65F10 65F35 65N30 65N06 35J25 × Cite Format Result Cite Review PDF Full Text: DOI
Popa, Constantin Least-squares solution of overdetermined inconsistent linear systems using Kaczmarz’s relaxation. (English) Zbl 0830.65027 Int. J. Comput. Math. 55, No. 1-2, 79-89 (1995). MSC: 65F20 65F10 × Cite Format Result Cite Review PDF Full Text: DOI
Popa, Constantin Mesh independence of the condition number of discrete Galerkin systems by preconditioning. (English) Zbl 0828.65053 Int. J. Comput. Math. 51, No. 1-2, 127-132 (1994). MSC: 65J10 65F05 65F35 47A50 × Cite Format Result Cite Review PDF Full Text: DOI