Infrastructure for Manipulation Polynomial Matrices R package polyMatrix version 0.9.16 CRAN Task View: NumericalMathematics (https://CRAN.R-project.org/view=NumericalMathematics) Implementation of class "polyMatrix" for storing a matrix of polynomials and implements basic matrix operations; including a determinant and characteristic polynomial. It is based on the package 'polynom' and uses a lot of its methods to implement matrix operations. This package includes 3 methods of triangularization of polynomial matrices: Extended Euclidean algorithm which is most classical but numerically unstable; Sylvester algorithm based on LQ decomposition; Interpolation algorithm is based on LQ decomposition and Newton interpolation. Both methods are described in D. Henrion & M. Sebek, Reliable numerical methods for polynomial matrix triangularization, IEEE Transactions on Automatic Control (Volume 44, Issue 3, Mar 1999, Pages 497-508) <doi:10.1109/9.751344> and in Salah Labhalla, Henri Lombardi & Roger Marlin, Algorithmes de calcule de la reduction de Hermite d'une matrice a coefficients polynomeaux, Theoretical Computer Science (Volume 161, Issue 1-2, July 1996, Pages 69-92) <doi:10.1016/0304-3975(95)00090-9>. Software Depends: R (>= 4.0) Imports: methods, polynom, Matrix Suggests: testthat, withr Nikolai Ryzhkov <namezys@gmail.com> Comprehensive R Archive Network (CRAN) Tamas Prohle [aut], Peter Prohle [aut], Nikolai Ryzhkov [aut, cre] (ORCID: <https://orcid.org/0000-0003-4896-280X>), Ildiko Laszlo [aut] (ORCID: <https://orcid.org/0000-0003-2324-8183>), Ulas Onat Alakent [ctb] MIT + file LICENSE (https://CRAN.R-project.org/package=polyMatrix/LICENSE) 2021-07-18 application/tgz https://CRAN.R-project.org/package=polyMatrix doi:10.32614/CRAN.package.polyMatrix