Now showing items 21-40 of 136

    • Combinatorial recurrences and linear difference equations 

      Jiménez Jiménez, María José; Encinas Bachiller, Andrés Marcos (2016-10-17)
      Article
      Open Access
      In this work we introduce the triangular arrays of depth greater than 1 given by linear recurrences, that generalize some well known recurrences that appear in enumerative combinatorics. In particular, we focussed on ...
    • Combinatorial recurrences and linear difference equations 

      Jiménez Jiménez, María José; Encinas Bachiller, Andrés Marcos (2016)
      Conference report
      Restricted access - publisher's policy
      In this work we introduce the triangular arrays of depth greater than 1 given by linear recurrences, that generalize some well-known recurrences that appear in enumerative combinatorics. In particular, we focussed on ...
    • Comparació de matrius de imatges en escala de grisos en format .jpg i .tiff en Octave 

      Clariana Basi, Nicolás (2018-05)
      Audiovisual
      Open Access
    • Consideraciones en torno al problema del desacoplamiento 

      Clotet Juan, Josep; Compta Creus, Albert (2005)
      Article
      Open Access
    • Coprime factorization of the transfer matrix of a singular linear systems 

      García Planas, María Isabel; López Cabeceira, Montserrat (Universidad de León, 2011)
      Conference report
      Open Access
    • 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, ...
    • D-stable controller design for Lipschitz NLPV system 

      Yang, Ruicong; Rotondo, Damiano; Puig Cayuela, Vicenç (2019)
      Conference report
      Open Access
      This paper addresses the design of a state-feedback controller for a class of nonlinear parameter varying (NLPV) systems in which the nonlinearity can be expressed as a parameter-varying Lipschitz term. The controller is ...
    • Decentralised reliable guaranteed cost control of uncertain systems: an LMI design 

      Pujol Vázquez, Gisela; Rodellar Benedé, José; Rossell Garriga, Josep Maria; Pozo Montero, Francesc (2007-05)
      Article
      Open Access
      The problem of designing a decentralised control scheme for a class of linear large scale interconnected systems with norm-bounded time-varying parameter uncertainties under a class of control failures is addressed. These ...
    • Description of characteristic non-hyperinvariant subspaces over the field GF(2) 

      Mingueza, David; Montoro López, María Eulalia; Pacha Andújar, Juan Ramón (Elsevier, 2013-10-26)
      Article
      Restricted access - publisher's policy
      Given a square matrix A, an A-invariant subspace is called hyperinvariant (respectively, characteristic) if and only if it is also invariant for all matrices T (respectively, nonsingular matrices T) that commute with A. ...
    • Desigualtats matricials lineals amb valors complexos 

      Rubió Massegú, Josep; Palacios Quiñonero, Francisco; Rossell Garriga, Josep Maria (2015-07-12)
      External research report
      Open Access
      Sovint ens trobem davant de desigualtats matricials lineals (LMIs) on les matrius involucrades prenen valors complexos. Es ben conegut que tota LMI complexa es pot reduir a una LMI real. En aquest treball establim les ...
    • Differentiable families of traceless matrix triples 

      García Planas, María Isabel; Klymchuk, Tetiana (springer-Verlag, 2019-12-06)
      Article
      Open Access
      Analysis of spectra of families of sets of matrices verifying certain properties is not simple because phenomena as singularities and bifurcations appear. An excellent tool for the analysis can be making use of versal ...
    • Discrete trace function and Poincaré inequality for the study of some linear systems 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (2019)
      Conference report
      Open Access
    • Diseño y cálculo de una matriz progresiva para realizar una garra pasacables por estampación en frío 

      Mariné Arce, Alberto (Universitat Politècnica de Catalunya, 2012-02)
      Master thesis (pre-Bologna period)
      Open Access
      Se trata de realizar el diseño y cálculo de una matriz progresiva de 9 estaciones o pasos con el fin de obtener una garra metálica pasa cables. El plano de la pieza viene definido por el cliente, lo que nos definirá que ...
    • 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 ...
    • Emergent Group Properties in Financial Markets 

      Doria Arrieta, Omar Alonso (Universitat Politècnica de Catalunya, 2011-06-17)
      Master thesis
      Open Access
      In the present we have analyzed the data from 480 companies of the S&P500 using the Random Matrix Theory and the Inverse Participation Ratio, we analyzed the eigenvalues and its respective eigenvectors in order to find ...
    • Estimación de la rigidez de estructuras de mampostería confinada a partir de datos dinámicos 

      Garcés, Francisco; Lafuente, Marianela; Genatios, Carlos; Mebarki, Ahmed (Universitat Politècnica de Catalunya, 2006)
      Article
      Open Access
      En este trabajo se presenta la aplicación de un método de estimación de la rigidez a estructuras de baja altura compuestas por muros de mampostería confinada. El método estima la rigidez a cortante (GA) y a flexión (EI), ...
    • Estimation of web proxy response times in community networks using matrix factorization algorithms 

      Gómez Sánchez, Eduardo; Bores Quijano, Diego; Bote Lorenzo, Miguel Luís; Meseguer Pallarès, Roc (2020-01-01)
      Article
      Open Access
      In community networks, users access the web using a proxy selected from a list, normally without regard to its performance. Knowing which proxies offer good response times for each client would improve the user experience ...
    • Estudio y evaluación de eficiencia de operaciones con matrices dispersas (sparse) en sistemas distribuidos 

      Raimbaud, Pierre (Universitat Politècnica de Catalunya, 2014-06-20)
      Bachelor thesis
      Open Access
      [CASTELLÀ] El objetivo de ese proyecto es estudiar y evaluar, en sistemas distribuidos, la eficiencia de operaciones con matrices dispersas (sparse), sabiendo la forma en la cual están almacenadas y los algoritmos usados, ...
    • Explicit inverse of nonsingular Jacobi matrices 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (2019-06-30)
      Article
      Restricted access - publisher's policy
      We present here the necessary and sufficient conditions for the invertibility of tridiagonal matrices, commonly named Jacobi matrices, and explicitly compute their inverse. The techniques we use are related with the solution ...
    • Factorization of the transfer matrix of a singular linear systems 

      García Planas, María Isabel; López Cabeceira, M. Montserrat (IPACS Electrinic Library, 2011)
      Part of book or chapter of book
      Restricted access - publisher's policy
      Given a linear dynamic time invariant represented by x + ( t ) = Ax ( t ) Bu ( t ) , y ( t ) = Cx ( t ) , we analyze con- ditions for obtention of a coprime factorization of trans- fer matrices of ...