# Eric Gregor

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 Jun4 asked Tail bounds on the sum of independent variables with known tail bounds May22 awarded Altruist May22 accepted Computing bottom $k$-eigenspace of a matrix via top $k$-eigenspace of another matrix May22 comment Computing bottom $k$-eigenspace of a matrix via top $k$-eigenspace of another matrix Yes, Will, I am indeed considering the absolute values of the eigenvalues. The problem with the inverse is that it is about as expensive as the full eigendecomposition. May22 comment Probability that one folded normal is bigger than another? I would love to see your sketch. May22 comment Computing bottom $k$-eigenspace of a matrix via top $k$-eigenspace of another matrix Why should the bottom eigenvectors of $R$ be the same here as the bottom eigenvectors of $S$? May22 comment Computing bottom $k$-eigenspace of a matrix via top $k$-eigenspace of another matrix Thank you for your comment. You are right. I have modified the question to reflect my real wish, which is a matrix that is less expensive to compute than the full eigendecomposition or inverse. May22 revised Computing bottom $k$-eigenspace of a matrix via top $k$-eigenspace of another matrix added 108 characters in body May20 asked Probability that one folded normal is bigger than another? May20 comment Computing volume of an ellipsoid with a cone about its major axis removed? 3d case is not so bad and specific equations for the cone are also not bad in this case May18 revised Equation of a cone in $\mathbb{R}^n$ formed by taking all points within angle $\alpha$ of a line. added 164 characters in body May18 asked Equation of a cone in $\mathbb{R}^n$ formed by taking all points within angle $\alpha$ of a line. May18 asked Computing volume of an ellipsoid with a cone about its major axis removed? May16 awarded Investor May14 asked Computing bottom $k$-eigenspace of a matrix via top $k$-eigenspace of another matrix Apr14 awarded Tumbleweed Apr8 accepted Simple question about inequality involving eigenvalue of a matrix and a scaled version of that matrix Apr7 asked How can you convert elliptical distribution expression to covariance matrix and vice versa? Apr1 revised Simple question about inequality involving eigenvalue of a matrix and a scaled version of that matrix edited body Mar30 revised Simple question about inequality involving eigenvalue of a matrix and a scaled version of that matrix edited body