Results 31 to 40 of about 1,327,597 (288)
Convex Banding of the Covariance Matrix [PDF]
, 2014 We introduce a new sparse estimator of the covariance matrix for high-dimensional models in which the variables have a known ordering. Our estimator, which is the solution to a convex optimization problem, is equivalently expressed as an estimator which ...
Bien, Jacob +2 more
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A class of cosmological matrix models [PDF]
Physics Letters B, 2005 We discuss a class of matrix models describing cosmology with a light-like singularity, generalizing the model proposed by Craps et al. in hep-th/0506180.
openaire +2 more sources
Confins, 2018 In the tropical Atlantic domain the most intense interpenetration between zonal and azonal elements occur in the mountainous landscapes defining its structure and functionality with regional geosystems which mix forestry belts over loamy and well ...
Roberto Marques Neto
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Bounds for the zeros of unilateral octonionic polynomials
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2021 In the present work it is proved that the zeros of a unilateral octonionic polynomial belong to the conjugacy classes of the latent roots of an appropriate lambda-matrix.
Serôdio Rogério +2 more
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Convenient parameterizations of matrices in terms of vectors [PDF]
, 2004 Convenient parameterizations of matrices in terms of vectors transform (certain classes of) matrix equations into covariant (hence rotation-invariant) vector equations. Certain recently introduced such parameterizations are tersely reviewed, and new ones
Bruschi +6 more
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Loewner Interpolation in Matrix Hardy Classes
Zeitschrift für Analysis und ihre Anwendungen, 1995 We study a Loewner type interpolation problem in the framework of matrix-valued \mathbb H_2 functions. We establish a necessary and sufficient condition for a matrix-valued function given on an arc of circle to be the trace of such an
Alpay, D., Leblond, J.
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Journal of Applied Mathematics, 2014 The combined matrix of a nonsingular real matrix A is the Hadamard (entrywise) product A∘A-1T. It is well known that row (column) sums of combined matrices are constant and equal to one. Recently, some results on combined matrices of different classes of
Rafael Bru +3 more
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The fuzzification of mathematical matrix in the environmental impact assessment of steel industry, Ghayen, Iran [PDF]
Computational Ecology and Software, 2020 Ghayenat steel complex is located in South Khorasan province near the Nimbolook city. In this research, the interactions between basic and supplementary criteria are evaluated using a mathematical matrix.
J. Dawoudian, Sr. Ahmadizadeh
doaj
On algebraic classification of quasi-exactly solvable matrix models [PDF]
, 1997 We suggest a generalization of the Lie algebraic approach for constructing quasi-exactly solvable one-dimensional Schroedinger equations which is due to Shifman and Turbiner in order to include into consideration matrix models.
Finkel F +14 more
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An Enumeration of the Equivalence Classes of Self-Dual Matrix Codes
, 2015 As a result of their applications in network coding, space-time coding, and coding for criss-cross errors, matrix codes have garnered significant attention; in various contexts, these codes have also been termed rank-metric codes, space-time codes over ...
Morrison, Katherine
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