Geoff Oxberry
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 Dec15 awarded Caucus Oct2 comment Expand $f(x) = x$ in a cosines serie If you use $-l$ to $l$, then because $x$ is an odd function, cosine is an even function, and the product of even and odd functions is odd, the cosine terms in your Fourier series will drop out, leaving you with only sine terms. Oct2 answered Prove that the limit, $\displaystyle\lim_{x \to 1^+} \frac{x-3}{3 - x - 2x^2}$, exists. Sep25 comment Wave Equation with Constant Boundary Conditions Welcome to SciComp! This question is a problem that doesn't require techniques in computational science, and it's probably a better fit for Mathematics Stack Exchange. Feb24 comment The space spanned by the rows of the Kernel matrix. This question has been cross-posted on Computational Science Stack Exchange. See scicomp.stackexchange.com/q/10860/276. Feb13 answered What is the practical impact of a matrix's condition number? Dec29 awarded Autobiographer Dec4 comment Transform derivative term of 2nd order Yes, this question probably should be migrated to Math.SE (if they want it). Feb19 awarded Yearling Feb15 answered Convexity of a function Apr18 awarded Commentator Apr18 comment How many significant figures are needed in base 2? @Must: I don't know yet. Let me consult with the math mods. Apr18 comment How many significant figures are needed in base 2? Question is very close to a cross-post on scicomp.SE. Apr4 awarded Citizen Patrol Apr4 comment Contiguous prime numbers with MPI (Want more ideas for an efficient algorithm) Math.SE mods: Cross post on scicomp.SE. Apr1 comment Contiguous prime numbers with MPI (Want more ideas for an efficient algorithm) scicomp.SE would also gladly take your question; we take lots of questions on MPI, and on the practical implementation of parallel algorithms. (I'm a mod on scicomp.SE.) Feb10 comment Rapid approximation of $\tanh(x)$ I thought about that algorithm, too, until I saw the "no table lookup" part. Feb9 comment Matrix-Square Root I thought about the polar decomposition method, too, when I looked at the problem, but then I thought about calculating it, looked it up, and came to a similar conclusion as J.M.. Feb8 comment Applied ODEs in trajectory problem Just to clarify, does $v$ have constant magnitude in the problem statement, or does $u + v$ have constant magnitude? If $u + v$ has constant magnitude, then I would expect both the magnitude and direction of $v$ to vary with the position of the boat, because $u$ is a constant vector. Feb7 answered Matrix-Square Root