Results 261 to 270 of about 107,141 (312)

Approximating a Symmetric Matrix

Psychometrika, 1990
We examine the least squares approximation C to a symmetric matrix B, when all diagonal elements get weight w relative to all nondiagonal elements. When B has positivity p and C is constrained to be positive semi-definite, our main result states that, when w ≥1/2, then the rank of C is never greater than p, and when w ≤1/2 then the rank of C is at ...
Bailey, R. A., Gower, J. C.
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Symmetric matrix means

Linear Algebra and its Applications, 2023
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Matrix Symmetrization

Journal of Guidance, Control, and Dynamics, 1998
Summary: In this note we point out that the symmetrized real matrix is also the symmetric matrix that is the closest, in the Euclidean norm, to the matrix being symmetrized. This implies that, when symmetrizing the solutions to Riccati and Lyapunov equations, one actually replaces the solution by its closest symmetric matrix.
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Mass matrix with symmetric mixing

Physical Review D, 1991
Extending the work of Barnhill, we propose distributing the mixing matrix between the up and down quarks equally. With this choice of gauge eigenstates, the resulting mixing matrix in the new basis is simply the identity and the gauge bosons couple to these states in an essentially trivial manner.
, Dixit, , Santhanam, , Thacker
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Completely ? symmetric R matrix

Letters in Mathematical Physics, 1992
An infinite-dimensional R matrix related to the limiting case n→∞ of the completely ℤn symmetric R matrix is discovered. This R matrix is expressed as an operator on C∞(S1×S1). Moreover, the fusion procedure of the R-operator is investigated and the finite-dimensional R matrices are constructed from the R operator.
Youichi Shibukawa, Kimio Ueno
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Symmetric Matrix Eigenvalue Techniques

2006
The article describes symmetric matrix eigenvalue techniques: basic methods (power method, inverse iteration, orthogonal iteration and QR iteration), tridiagonalization and implicitly shifted QR method, divide-and-conquer method, bisection and inverse iteration, the method of multiple relatively robust representations, Jacobi method and Lanczos method.
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