Results 171 to 180 of about 2,874 (210)

An Improved Two-Stage RARE Algorithm for Mixed Far-Field and Near-Field Source Localization Under Unknown Mutual Coupling with the Uniform Linear Sensor Array. [PDF]

Sensors (Basel)
Chen K, Deng K, Zhang J.
europepmc   +1 more source

Using Randomized Nyström Preconditioners to Accelerate Variational Image Reconstruction. [PDF]

IEEE Trans Comput Imaging
Hong T, Xu Z, Hu J, Fessler JA.
europepmc   +1 more source

Local certification of unitary operations. [PDF]

Sci Rep
Kukulski R, Stępniak M, Hendzel K, Pawela Ł, Gardas B, Puchała Z.   +5 more
europepmc   +1 more source

Optimal Designs for Discrete Choice Models Via Graph Laplacians. [PDF]

J Stat Theory Pract
Röttger F, Kahle T, Schwabe R.
europepmc   +1 more source

Spin-Bounded Correlations: Rotation Boxes Within and Beyond Quantum Theory. [PDF]

Commun Math Phys
Aloy A, Galley TD, Jones CL, Ludescher SL, Müller MP.   +4 more
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FEMA-Long: Modeling unstructured covariances for discovery of time-dependent effects in large-scale longitudinal datasets. [PDF]

PLoS Genet
Parekh P, Parker N, Pecheva D, Frei E, Vaudel M, Smith DM, Rigby A, Jahołkowski P, Sønderby IE, Birkenæs V, Bakken NR, Fan CC, Makowski C, Kopal J, Loughnan R, Hagler DJ, van der Meer D, Johansson S, Njølstad PR, Jernigan TL, Thompson WK, Frei O, Shadrin AA, Nichols TE, Andreassen OA, Dale AM.   +25 more
europepmc   +1 more source

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A Measure Of Asymmetry For Positive Semidefinite Matrices

Optimization, 2003
It is known that a continuous map is the gradient of a convex function if and only if it is cyclically monotone. Also, a differentiable map F is the gradient of a function if and only if the matrices F ′(x) are symmetric for all x in the domain. Based on this connection between symmetry and monotonicity, we define a measure of asymmetry for positive ...
Jean-Pierre Crouzeix
exaly   +3 more sources

Transformation of non positive semidefinite correlation matrices [PDF]

Communications in Statistics - Theory and Methods, 1993
In multivariate statistics, estimation of the covariance or correlation matrix is of crucial importance. Computational and other arguments often lead to the use of coordinate-dependent estimators, yielding matrices that are symmetric but not positive semidefinite.
Rousseeuw, P.J., Molenberghs, G.
openaire   +3 more sources

Matrices with positive semidefinite real part [PDF]

Linear and Multilinear Algebra, 2019
Matrices with the property that the real part is positive definite, have been studied for the past five decades or more.
Choudhury, Projesh Nath, Sivakumar, KC
openaire   +3 more sources