mathie's bits

Month: November 2005

  • San Jose, Sunnyvale among safest cities

    San Jose and Sunnyvale are among the safest cities in the United States and Richmond and Oakland are among the most dangerous.

  • UW – School of CS got $25M

    The University of Waterloo received a huge “Google dividend” yesterday when David Cheriton, one of the search engine giant’s early investors, donated $25-million to the school’s well-respected computer science department. Mr. Cheriton estimates the return on his US$200,000 investment in Google at about 5,000%. CS School renamed to David R. Cheriton School of Computer Science.…

  • Linear Regression PHP Class

    This PHP 5 class accepts an array of data as input, performs linear regression analysis and returns the trend line. The result is the same as in Excel (Tools/Data Analysis/Regression) Sample Usage // sales data for the last 30 quarters $vSales = array( 637381,700986,641305,660285,604474,565316,598734,688690,723406,697358, 669910,605636,526655,555165,625800,579405,588317,634433,628443,570597, 662584,763516,742150,703209,669883,586504,489240,648875,692212,586509 ); $vRegression = new CRegressionLinear($vSales); $vNextQuarter = $vRegression->predict(); //…

  • Referrer & AJAX

    Firefox does not pass referrer string while IE does.

  • RSLite – A cookie-based AJAX solution

    This is another solution written by Brent Ashley for asynchronous information fetching, way before the term AJAX were coined var RSLite; function RSLiteObject(){ this.interval = 1000; this.attempts = 3; this.i = new Image(); this.call = function (page){ var d = new Date(); document.cookie = ‘RSLite=x; expires=Fri, 31 Dec 1999 23:59:59 GMT; path=/;’; this.i.src = page+’&time=’+d.getTime();…

  • map – Google Search

    If you search for “map” or “maps” on Google, the first result is not maps.google.com but MapQuest. This surprised me!

  • TV: PRISON BREAK

    FOX Broadcasting Company: PRISON BREAK With too many pathetic reality TV shows these years. One of the best TV show I’ve ever seen. It’s an excellent show. Very original and high level of suspense.

  • Funny Video – I Love Sky Video

    I Love Sky Video on Metacafe

  • Make your files immutable in Linux which even root can’t delete

    Root account in Linux is considered all powerful. You can make or break the system if you have root access to a Linux box. Here is a cool tip to make your files immutable even by root. read more | digg story

  • Math and the Computer Science Major

    Computer science majors tend to struggle for reasons that have very little to do with computers. More often than not, such struggles are rooted in weaknesses related to math. If you plan on getting a CS degree, you need to come to grips with one important fact first: computer science has more to do with…