Gabriel Landi
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 Sep 10 asked Discrete Analogue of the Fundamental Theorem of Calculus Aug 31 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. Aug 30 asked Modification of the continuous time Lyapunov Equation Aug 21 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. Aug 20 accepted Distance between discrete random variables Aug 19 asked Reference suggestion: eigenvalues of tridiagonal matrices Aug 16 accepted Solving for specific entries in a Lyapunov Equation Aug 16 accepted Approximate solution for the root of a non-linear function Aug 14 comment Solving for specific entries in a Lyapunov Equation Actually, I have been looking at the web and haven't yet found a method for solving the eq. for B. Any ideas on where to look? Aug 14 comment Solving for specific entries in a Lyapunov Equation Wow, this is great. Thank you! I'll start testing this idea right away and post some results as soon as they come out. Aug 9 comment Solving for specific entries in a Lyapunov Equation @dato, Sorry I don't understand. Aug 9 comment Solving for specific entries in a Lyapunov Equation The solution of the Lyapunov equation, $R$, will be symmetric and positive definite (it is actually a covariance matrix). What I can prove is that $C$ is anti-symmetric ($C^\text{T} = -C$) Aug 9 asked Solving for specific entries in a Lyapunov Equation Jul 30 awarded Critic Jul 28 comment Partial Fractions Expansion of $\tanh(z)/z$ Yeah. Probably. Hehe. It's just that I never know how to deal with sums in any other way than comparing it to other sums. Again, thank you for the answer J.M. Jul 28 answered Self-study resources for basic probability? Jul 28 accepted Partial Fractions Expansion of $\tanh(z)/z$ Jul 28 comment Partial Fractions Expansion of $\tanh(z)/z$ @jm this is great; does all such formulas rely on manipulating other known products and sums? Isn't there, for instance, a Fourier transform or generating function approach (or something...)? Again, thank you for the support. Jul 27 comment Approximate solution for the root of a non-linear function Let $F_\pm(t) = e^t (g \cos(\omega t-\phi) \pm b)$. The first point, $t_0$ say, is computed from either $F_\pm(t_0) = F(0) \mp \alpha$, where $\alpha$ is a positive constant. From there one the roots are computed sequentially as above. Jul 27 revised Approximate solution for the root of a non-linear function Updated the instability aspect of the problem.