84209 20200513005823.0 doi 10.1016/j.cam.2018.09.029 sideral 108573 ART-2018-108573 eng Alonso, P. Combined matrices of almost strictly sign regular matrices 2018 Access copy available to the general public Unrestricted The combined matrix is a very useful concept for many applications. Almost strictly sign regular (ASSR) matrices form an important structured class of matrices with two possible zero patterns, which are either type-I staircase or type-II staircase. We prove that, under an irreducibility condition, the pattern of zero and nonzero entries of an ASSR matrix is preserved by the corresponding combined matrix. Without the irreducibility condition, it is proved that type-I and type-II staircases are still preserved. Illustrative numerical examples are included. info:eu-repo/grantAgreement/ES/MINECO-FEDER/MTM2015-65433-P info:eu-repo/grantAgreement/ES/MINECO-FEDER/MTM2017-90682-REDT info:eu-repo/grantAgreement/ES/MINECO-FEDER/TIN2017-87600-P info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 1.883 2018 MATHEMATICS, APPLIED 47 / 254 = 0.185 2018 Q1 T1 0.849 2018 Computational Mathematics 2018 Q2 Applied Mathematics 2018 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0002-1340-0666 Peña, J.M. Universidad de Zaragoza Serrano, M.L. 2005 595 Universidad de Zaragoza Dpto. Matemática Aplicada Área Matemática Aplicada 354 (2018), 144 - 151 J. comput. appl. math. Journal of Computational and Applied Mathematics 0377-0427 189914 http://zaguan.unizar.es/record/84209/files/texto_completo.pdf Postprint 439698 http://zaguan.unizar.es/record/84209/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:84209 articulos driver 2020-05-13-00:50:35 ARTICLE