Chris Taylor
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 Jul29 awarded Good Answer Jul29 revised Interview puzzle with a deck of cards, some cards upside-down deleted 7 characters in body Jul28 awarded Nice Answer Jul28 comment Interview puzzle with a deck of cards, some cards upside-down @Wonder Yes, it is the same answer (+1) - I saw that another answer appeared just as I was finishing mine, but since I'd already written it I hit 'post' anyway. Jul28 answered Interview puzzle with a deck of cards, some cards upside-down Jul18 comment What numerical methods are known to solve $L_1$ regularized quadratic programming problems? I'll certainly give it a shot. I've already tried several general-purpose solvers (open source and commercial) which have been okay, but not as fast as a couple of hand-rolled special-purpose solvers. I've not tried CVX yet though... Jul18 accepted What numerical methods are known to solve $L_1$ regularized quadratic programming problems? Jul18 comment What numerical methods are known to solve $L_1$ regularized quadratic programming problems? Thanks Michael, this is really helpful - I'm exploring several different options you suggested. I never have to solve a particularly tricky problem (mostly quadratic programming with an $L_1$ term and sometimes linear inequality constraints) but I need to solve a lot of them, so speed is a factor for me. Thanks for your help! Jul16 asked What numerical methods are known to solve $L_1$ regularized quadratic programming problems? Jul9 revised online estimation of autoregressive process added 1 character in body Jul2 awarded Curious Jun18 awarded Popular Question May27 answered Find StdDev of a percentage list May23 awarded Enlightened May23 awarded Nice Answer May21 comment A fair coin is flipped 2k times. What is the probability that it comes up tails more often than it comes up heads? It seems likely that the "2k" in the question refers to a general even number $2k$ rather than "2000". May7 comment Help with 2 questions my professor gave us For (i) assume there are two solutions $a,b$ s.t. $a^2=r$ and $b^2=r$ with $a\neq b$. Then either $a>b$ or \$a