Jason S
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 Feb 28 comment Finding a similarity transform for a matrix that minimizes the (2-norm) condition number Hmmm... how does this answer my original question about condition number? If similarity transforms minimize the $||B||$, why does that mean they also minimize $||B^{-1}||$? Feb 12 comment simple example of recursive least squares (RLS) Points for a practical short example... but I need some understanding, and throwing code at me, even simple code that I can read and translate to matrix algebra, doesn't help with that understanding. Jan 13 asked numerically obtaining relative condition number of a monic polynomial with respect to finding its roots Jan 4 revised B and C matrices for real modal representation of a 2x2 linear system with complex eigenvalues added 134 characters in body Jan 4 accepted constrained complex number equation requiring imaginary part to be zero Jan 4 comment constrained complex number equation requiring imaginary part to be zero That's interesting; that tells me that my initial constraint of $|k_1| = |k_2| = 1$ can't always be met. (e.g. if $b_1 = 2+3j$ and $b_2 = 4+5j$); also that if I have one solution $(k_1,k_2)$ then $(k_1e^{j\theta}, k_2e^{-j\theta})$ is also a solution.for any arbitrary $\theta$. Jan 3 revised constrained complex number equation requiring imaginary part to be zero added 23 characters in body Jan 3 comment constrained complex number equation requiring imaginary part to be zero yes (I'm an EE) Jan 3 asked constrained complex number equation requiring imaginary part to be zero Jan 3 answered B and C matrices for real modal representation of a 2x2 linear system with complex eigenvalues Jan 3 revised B and C matrices for real modal representation of a 2x2 linear system with complex eigenvalues edited tags Jan 3 revised B and C matrices for real modal representation of a 2x2 linear system with complex eigenvalues added 260 characters in body Jan 3 comment Prove that, $a^2b(a-b)+b^2c(b-c)+c^2a(c-a) \geq 0.$ you skipped one point, namely that you have to show $A, B, C$ are all nonnegative. (which is implied by the triangle inequality) Jan 3 revised B and C matrices for real modal representation of a 2x2 linear system with complex eigenvalues added 797 characters in body Jan 3 asked B and C matrices for real modal representation of a 2x2 linear system with complex eigenvalues Jan 3 comment similarity transform mapping diagonal matrix of complex conjugates, to real matrix where does the matrix in your sentence "In particular, calculate the first eigenvector" come from? Is that $A-\lambda I$ for $\lambda = a+bj$? Jan 3 comment similarity transform mapping diagonal matrix of complex conjugates, to real matrix well, I've been searching the web, but I have Strang's Intro to Linear Algebra. Jan 3 accepted similarity transform mapping diagonal matrix of complex conjugates, to real matrix Jan 3 comment similarity transform mapping diagonal matrix of complex conjugates, to real matrix excellent -- thanks! I would have thought discussions of diagonalization and block diagonalization and similarity transforms would include this, but I didn't see any mention of it. Jan 3 comment similarity transform mapping diagonal matrix of complex conjugates, to real matrix really?! weird.