Gabriel Landi
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 Sep24 awarded Autobiographer Jul2 awarded Curious Jul6 awarded Yearling Jan15 accepted Average distance between random points inside a cube Jan14 comment Average distance between random points inside a cube Oh! Yeah, I think that is it. The nearest-neighbour distance. I got everything confused. Jan14 comment Average distance between random points inside a cube I am still confused about where the concentration of points enter. I mean, if $n$ is large, than the average distance between them should be smaller, but I don't see how that enters the calculation. Anyway, thank you for the help. Jan14 asked Average distance between random points inside a cube Nov29 comment Solving for the trace of a matrix This is incredible. Thank you so very very much. Nov29 accepted Solving for the trace of a matrix Nov27 comment Solving for the trace of a matrix I have come across that manipulation but, unfortunately, it does not remove $\Theta$ so it doesn't really work much. But, in any case, thanks for your help. Nov27 comment Solving for the trace of a matrix @Berci the matrix $\Theta$ is uniquely determined from the Lyapunov equation. Hence so is $F$. Nov27 asked Solving for the trace of a matrix Nov17 comment Reference suggestion: eigenvalues of tridiagonal matrices @Elias Great. Thank you very much. Sep10 accepted Discrete Analogue of the Fundamental Theorem of Calculus Sep10 comment Discrete Analogue of the Fundamental Theorem of Calculus Good Point. :) Once again, thank you. Sep10 comment Discrete Analogue of the Fundamental Theorem of Calculus I see. But isn't this notation misleading? I mean, in continuous calculus you write $d/dx$ to specify the derivative is with respect to $x$. Wouldn't $\Delta_n$ be a more adequate notation? And is this common in difference calculus literature? Anyway, thank you very much for the answer. Sep10 asked Discrete Analogue of the Fundamental Theorem of Calculus Aug31 comment Modification of the continuous time Lyapunov Equation The idea in your answer is probably unfeasible, since my system has $n > 200$. Could you point out a reference for this pole-place method? By the way, thanks for the support. Aug30 asked Modification of the continuous time Lyapunov Equation Aug21 comment Calculate a whitening matrix without using inverses? Isn't computing the entire eigenvector matrix also expensive, even for a symmetric matrix? I wonder if Cholesky itself isn't faster.