» Paranoia And Selling A Laptop
18 hours ago by Gödel's Lost Letter and P=NP from rjlipton
How do we erase a hard disk, for sure? Richard Nixon was not a theorist—of course. He was the President of the United States from 1969 until 1974, when he resigned in disgrace. He was also an “un-indicted co-conspirator” and probably one of the most paranoid presidents ever. Today I want to talk about paranoia. [...]

» The Return of My Laptop
18 hours ago by Learning Curves
So now I could blog again, as I have my home laptop back in my possession after to lending it to someone since Monday. I have a strict rule that my work laptop is for work only and for nothing non-work. (Both jobs count.)Anecdote from TuesdayGuy I know who appeared in Hard Problems: Can I borrow your laptop to read this paper [which he was reading on paper, dead-tree edition]? I can't find whe ...

» Pythagorean triangles on a circle
18 hours ago by Wild About Math! from Sol
If you’ve not yet discovered the Wolfram Demonstrations Project site you’re in for a great treat. The site has tons of interactive Math applications that you can run with the free Mathematica Player. In other words, you don’t need to own Mathematica to run the demonstration apps. I find many of the apps to be very interesting. One I particularly like is “Enumerating Pythago ...

» Where in the World is MathNotations?
19 hours ago by MathNotations from Dave Marain
Have you been wondering about the question in the title or just assuming that I'm on hiatus? No videos? No provocative comments about standardized curriculum? No interviews with the movers and shakers in math education on the national front? Most importantly, no anecdotes from my 3-yr old grandson? Is the world coming to an end? Seriously, I suspect the world is still spinning on its axis, pe ...

» emacs, vim, svn, doxygen, and friends - Stocking your Unix Toolbox
20 hours ago by Please Make A Note from yNot
Charles Reid, a doctoral candidate at the University of Utah and a very good colleague of mine, has kindly agreed to post some lectures from his summer Scientific Computing Workshop on PMAN. Charles is not only knowledgeable in all Unix related stuff (Unix, Linux, OSX... and all things ending in x), but also a very rigorous researcher. You can find his original workshop series on his website, at ...

» Infinite Products, Part 2
20 hours ago by The Unapologetic Mathematician from John Armstrong
After all of yesterday’s definitions, we continue examining the countably infinite product of a sequence of totally finite measure spaces such that each . If and are positive integers with , it may happen that a non-empty subset is both a -cylinder and a -cylinder. By yesterday’s result, we find that we can write both [...]

» Visualizing regionprops ellipse measurements
21 hours ago by Steve on Image Processing from Steve
The Image Processing Toolbox function regionprops gives you measurements of shape-based measurements of image regions. It's pretty useful, and I have shown many examples of it on this blog. Today I want to show you how to visualize the ellipse-based measurements produced by regionprops. [...]

» Knock-Knock Jokes Redux
21 hours ago by Adventures in Applied Math
We've had a lot more fun with knock-knock jokes lately. I taught Vinny some pretty hilarious* jokes, including:A: Knock knock!B: Who's there?A: Boo.B: Boo who?A: Don't cry, it's just a joke!A: Knock knock!B: Who's there?A: Ach.B: Ach Who?A: Bless you!A: Knock knock!B: Who's there?A: Anita.B: Anita who?A: Anita tissue! Achoo!The entertainment value of that last joke has just been priceless. When ...

» Houston secrets
1 day ago by The Endeavour from John
The Engines of our Ingenuity episode Secret City discusses little-known city features. I was particularly interested in the Houston locations the show mentioned. I’ve been through the downtown tunnels John Leinhard mentions, but I was not familiar with the 1940 Air Terminal Museum or the Gable Street Power Station. Here are three Houston-area attractions that I [...]

» An alternative to the ranksum function using the NAG toolbox for MATLAB
1 day ago by Walking Randomly from Mike Croucher
The MATLAB function ranksum is part of MATLAB’s Statistics Toolbox. Like many organizations who use network licensing for MATLAB and its toolboxes, my employer, The University of Manchester, sometimes runs out of licenses for this toolbox which leads to following error message when you attempt to evaluate ranksum. ??? License checkout failed. License Manager Error [...]

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