The constrained least-squares n × n-matrix problem where the feasibility set is the subspace of the Toeplitz matrices is analyzed. The general, the upper and lower triangular cases are solved by ...

first I want to thank you for your great work and your very good explanations series in YT. I encounter a problem when trying to estimate a adjacency matrix from ...

Bill Gates said, "We all need people who will give us feedback. That's how we improve.” Great leaders know positive feedback is essential to boost employee morale, productivity and engagement. So much ...

The variance-covariance matrix of the estimated parameters (vcov) does not appear to be positive definite! The smallest eigenvalue (= 0.000000e+00) is smaller than ...

We consider random walks on the cone of mxm positive definite matrices, where the underlying random matrices have orthogonally invariant distributions on the cone and the Riemannian metric is the ...

ABSTRACT: We derive necessary and sufficient conditions for the existence of a Hermitian nonnegative-definite solution to the matrix equation AXB = C. Moreover, we derive a representation of a general ...

I have a stepson who is 16. His time is split between his mother and us. We are trying to instill values, respect, manners, etc., but when it is time for him to go to his mother's everything goes out ...

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Center for Research and Development in Mathematics and Applications, Department of Mathematics, University of Aveiro, Aveiro, Portugal. Department of Mathematics, Faculty of Science and Technology, ...