Now showing items 1-20 of 33

  • Bounding the distance from a reachable/controllable equisingular switched linear system to the set of non-reachable/uncontrollable ones 

    Magret Planas, Maria dels Dolors (2016)
    Article
    Open Access
    No necessary and sufficient condition for reachability of switched linear singular systems has been found in general, but only in the case of the so-called “equisingular systems”. In this case, it is possible to obtain an ...
  • Códigos monomiales vistos como subespacios vectoriales invariantes 

    García Planas, María Isabel; Magret Planas, Maria dels Dolors; Um, Laurence Emilie (2015)
    Conference report
    Open Access
    Es bien sabido que los códigos cíclicos son muy útiles en aplicaciones en general y a los criptosistemas en particular, ya que no resultan costosos desde un punto de vista computacional, además estos códigos alcanzan la ...
  • Controllability of second-order switched linear systems 

    Clotet Juan, Josep; García Planas, María Isabel; Magret Planas, Maria dels Dolors (2011-10)
    External research report
    Open Access
    We consider second-order switched linear systems and obtain sufficient conditions for such systems to be controllable.
  • Cyclic codes as hyperinvariant subspaces 

    García Planas, María Isabel; Magret Planas, Maria dels Dolors; Montoro López, Maria Eulalia (2013)
    Conference report
    Open Access
    It is known the relationship between cyclic codes and invariant subspaces. We present in this work some codes which are obtained from invariant and hyperinvariant subspaces of the linear maps having associated matrices, ...
  • Deformaciones miniversales de parejas de tensores de segundo orden 

    Clotet Juan, Josep; Magret Planas, Maria dels Dolors; Peña Carrera, Marta (Universidad de Sevilla, 2007-09)
    Conference report
    Open Access
    Consideramos en el espacio de parejas de tensores tension y deformacion la relacion de equivalencia que se corresponde con cambios de base ortonormales. Identificandolas con parejas de matrices cuadradas, podemos utilizar ...
  • Differentiable families of planar bimodal linear control systems 

    Ferrer Llop, Josep; Magret Planas, Maria dels Dolors; Peña Carrera, Marta (2014-06)
    Article
    Open Access
    We consider bimodal linear control systems consisting of two subsystems acting on each side of a given hyperplane, assuming continuity along it. For a differentiable family of planar bimodal linear control systems, we ...
  • Differentiable families of stabilizers for planar bimodal linear control systems 

    Ferrer Llop, Josep; Magret Planas, Maria dels Dolors; Peña Carrera, Marta (American Institute of Physics (AIP), 2013)
    Conference report
    Open Access
    We consider bimodal linear control systems consisting of two subsystems acting on each side of a given hyperplane, assuming continuity along the separating hyperplane. For a differentiable family of controllable planar ...
  • Distance from a controllable switched linear system to an uncontrollable one 

    Clotet Juan, Josep; Ferrer Llop, Josep; Magret Planas, Maria dels Dolors (Servicio de publicaciones de la UPV, 2010)
    Conference lecture
    Open Access
    The set of controllable switched linear systems is an open set in the space of all switched linear systems. Then it makes sense to compute the distance from a controllable switched linear system to the set of uncontrollable ...
  • Eigenvalues and eigenvectors of monomial matrices 

    García Planas, María Isabel; Magret Planas, Maria dels Dolors (Universidad de Cádiz, 2015)
    Conference report
    Open Access
    Spectral properties of special matrices matrices have been widely applied. We focus on monomial matrices over a finite field $F_{p}$, $p \neq 2$. We describe a way to find the minimal annihilating polynomial, a set of ...
  • Eigenvectors of permutation matrices 

    García Planas, María Isabel; Magret Planas, Maria dels Dolors (2015)
    Article
    Open Access
    The spectral properties of special matrices have been widely studied, because of their applications. We focus on permutation matrices over a finite field and, more concretely, we compute the minimal annihilating polynomial, ...
  • Eines d'àlgebra lineal i matricial per a l'enginyeria 

    García Planas, María Isabel; Magret Planas, Maria dels Dolors (2014)
    Book
    Open Access
  • Entorn del desenvolupament històric de les equacions algebraiques 

    Magret Planas, Maria dels Dolors; Massa Esteve, Maria Rosa (2005)
    Article
    Open Access
    El conjunt dels nombres enters i el de polinomis amb coeficients en un cos són els exemples més bàsics d’anells commutatius, que constitueixen l’essència de l’àlgebra commutativa, branca de les matemàtiques estretament ...
  • Estimating distances from quadruples satisfying stability properties to quadruples not satisfying them 

    Clotet Juan, Josep; García Planas, María Isabel; Magret Planas, Maria dels Dolors (2000)
    Article
    Open Access
    We consider quadruples of matrices (E,A,B,C) defining generalized linear multivariable time-invariant dynamical systems, with E,A square matrices and B, C rectangular matrices. Using geometrical techniques we present ...
  • Familias diferenciables de inversas de Drazin 

    Clotet Juan, Josep; Magret Planas, Maria dels Dolors (2005)
    Article
    Open Access
    Las inversas de Drazin son una clase de inversa generalizada entre cuyas aplicaciones podemos mencionar la resoluci´on de ecuaciones diferenciales, ecuaciones en diferencias, estudio de cadenas de Markov, etc. En esta ...
  • Forma reduïda de Jordan : aplicacions 

    Magret Planas, Maria dels Dolors; Puig Pla, Carles; Hernando Martín, María del Carmen (Edicions UPC, 1997)
    Book
    Restricted access to the UPC academic community
    La forma reduïda de Jordan té un paper fonamental en la classificació d'endoformismes i és extramadament important en la Matemàtica Aplicada, ja que dóna resposta a qüestions relatives a una gran diversitat d'aplicacions. ...
  • Higher-Order Singular Systems and Polynomial Matrices 

    Magret Planas, Maria dels Dolors (2005)
    Article
    Open Access
    There is a one-to-one correspondence between the set of quadruples of matrices defining singular linear time-invariant dynamical systems and a subset of the set of polynomial matrices. This correspondence preserves the ...
  • Introducción a la teoría de matrices polinomiales 

    García Planas, María Isabel; Magret Planas, Maria dels Dolors (Edicions UPC, 1999)
    Book
    Restricted access to the UPC academic community
    El presente libro proporciona un tratamiento comprensivo de la teoría de matrices polinomiales, que es una parte del álgebra lineal cuyos conceptos y resultados principales han sido obtenidos en las dos últimas décadas y ...
  • Isometries of the Hamming space and equivalence relations of linear codes over a finite field 

    García Planas, María Isabel; Magret Planas, Maria dels Dolors (Springer, 2016)
    Part of book or chapter of book
    Restricted access - publisher's policy
  • Isometries of the hamming space and equivalence relations of linear codes over a finite field 

    García Planas, María Isabel; Magret Planas, Maria dels Dolors (Springer, 2016)
    Part of book or chapter of book
    Restricted access - publisher's policy
    Detection and error capabilities are preserved when applying to a linear code an isomorphism which preserves Hamming distance. We study here two such isomorphisms: permutation isometries and monomial isometries
  • Miniversal Deformations of Bimodal Picewise Linear Systems 

    Ferrer Llop, Josep; Magret Planas, Maria dels Dolors; Pacha Andújar, Juan Ramón; Peña Carrera, Marta (Servicio de publicaciones de la UPV, 2010)
    Conference lecture
    Open Access
    Bimodal linear systems are those consisting of two linear systems on each side of a given hyperplane, having continuous dynamics along that hyperplane. In this work, we focus on the derivation of (orthogonal) miniversal ...