Results 21 to 30 of about 458,395 (307)

The group inverse of circulant matrices depending on four parameters

open access: yesSpecial Matrices, 2021
Explicit expressions for the coefficients of the group inverse of a circulant matrix depending on four complex parameters are analytically derived. The computation of the entries of the group inverse are now reduced to the evaluation of a polynomial ...
Carmona A.   +3 more
doaj   +1 more source

Robust Prediction of Single and Multiple Point Protein Mutations Stability Changes

open access: yesBiomolecules, 2019
Accurate prediction of protein stability changes resulting from amino acid substitutions is of utmost importance in medicine to better understand which mutations are deleterious, leading to diseases, and which are neutral.
Óscar Álvarez-Machancoses   +3 more
doaj   +1 more source

Characterizations of the group invertibility of a matrix revisited

open access: yesDemonstratio Mathematica, 2022
A square complex matrix AA is said to be group invertible if there exists a matrix XX such that AXA=AAXA=A, XAX=XXAX=X, and AX=XAAX=XA hold, and such a matrix XX is called the group inverse of AA.
Tian Yongge
doaj   +1 more source

Nonnegative group inverses

open access: yesLinear Algebra and its Applications, 1991
AbstractWe characterize when a nonnegative block lower triangular matrix possesses a nonnegative group inverse, and when it does, we give an explicit formula for it. As a consequence we show that a necessary condition for the existence of such an inverse is that the eigenspace of the matrix corresponding to its Perron root is spanned by eigenvectors ...
Michael Neumann, Hans Joachim Werner
openaire   +2 more sources

Further characterizations of the m-weak group inverse of a complex matrix

open access: yesAIMS Mathematics, 2022
In this paper, we introduce certain different characterizations and several new properties of the m-weak group inverse of a complex matrix. Also, the relationship between the m-weak group inverse and a nonsingular bordered matrix is established as well ...
Wanlin Jiang, Kezheng Zuo
doaj   +1 more source

M-matrix and inverse M-matrix extensions

open access: yesSpecial Matrices, 2020
A class of matrices that simultaneously generalizes the M-matrices and the inverse M-matrices is brought forward and its properties are reviewed. It is interesting to see how this class bridges the properties of the matrices it generalizes and provides a
McDonald J.J.   +6 more
doaj   +1 more source

A class of singular Ro-matrices and extensions to semidefinite linear complementarity problems [PDF]

open access: yesYugoslav Journal of Operations Research, 2013
For ARnxn and qRn, the linear complementarity problem LCP(A, q) is to determine if there is xRn such that x ≥ 0; y = Ax + q ≥ 0 and xT y = 0. Such an x is called a solution of LCP(A,q).
Sivakumar K.C.
doaj   +1 more source

Gait Event Prediction Using Surface Electromyography in Parkinsonian Patients

open access: yesBioengineering, 2023
Gait disturbances are common manifestations of Parkinson’s disease (PD), with unmet therapeutic needs. Inertial measurement units (IMUs) are capable of monitoring gait, but they lack neurophysiological information that may be crucial for studying gait ...
Stefan Haufe   +3 more
doaj   +1 more source

The inverse groups? [PDF]

open access: yesCanadian Medical Association Journal, 2009
Lee and colleagues (Improving the quality of care for infants: a cluster randomized controlled trial, Aug. 10 online) have presented an intriguing evaluation of 2 QI interventions in their NICUs.
openaire   +2 more sources

Theoretical and Computational Methods to Resistance Distances in Novel Graphs Operations

open access: yesIEEE Access, 2019
Motivated by the recent research on the computation of resistance distance, this paper aims to compute resistance distance in two classes of graphs, which are generated by three graphs.
Li Zhang, Jia-Bao Liu
doaj   +1 more source

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