Tech

In The Snow, At 10,000 feet, In A Suit And Tie!

When I first arrived in California, I was a little uncomfortable because everyone seemed so insane. Unfortunately, this insanity may be somewhat contagious.

Valentines for Nina and Lola

Nina and Lola,

Whenever I'm away from you and I spend a lot of time writing computer code, I think about the pretty patterns that your names make in binary code. Your names, Nina and Lola, are wonderful in so many ways that I could never describe them all. Here's one of those ways.

If you use the following Common Lisp expression, you can find the graphical binary representation of your names in binary code.

  (defun binary-name (name zero one)
    (map 'string (lambda (c) (case c (#\1 one) (#\0 zero) (t c)))

Git and Subversion

I'm not a revision control guru, but I've been using Git a lot more than Subversion in the last couple of years. Recently I found myself having to deal with a Subversion repository again. Stubbornly, I began to think about how to use the Subversion respository with Git. I had seen git-svn here and there (for example, I think apt recommends it when you install git-core), and I thought it might have the functionality that I was looking for. It turns out I was right; I now fail to understand why it took me so long to start using this most excellent tool.

Common Plisp: List Processing in Perl

I was recently talking on the phone with a person who lives at least 2,200 miles away and whom I'd never met or spoken to before. This is a surprisingly common occurrence in this day and age. I was explaining some of the things that I like about Perl. When I got to the part about how I love writing 4 or 5 lines of code where programmers of other languages have to write 20 or 30, my new friend hinted that he thought I was talking about completely unreadable Perl code.

Magit, HDIELWT, and Dot Emacs On Steroids

Everyone has experienced the feeling of familiarizing oneself with a technology over a period of a few weeks or months and arriving at the "How did I ever live without this?" moment (hereto forth HDIELWT). I have often pondered that question quite seriously, trying to remember hard how I managed before tool X came along. It has happened to me with many a tool, including Emacs, Common Lisp, Delicious, Reddit, and several Google products, such as Gmail, Reader, Calendar, and Voice.

Hacking XQuery Into Emacs With Berkeley DB XML

I often need to query an XML document without having to load it into a native XML database. In a perfect world, I would simply load the document into my editor, sprinkle some XQuery into the document, highlight the portions I want to evaluate, then hit a key combination to view a new window with the results. The whole operation should take all of a few seconds for a large class of XML documents and queries.

Thankfully, this is indeed a perfect world. And, I'm an Emacs user.

MP4 Video to MP3 File Using ffmpeg (Ubuntu 9.10 Karmic Koala)

Here's how you can use ffmpeg to convert a video (an MP4 video, for example) to an MP3 that you can load on your MP3 player:
    ffmpeg -i video.mp4 -f mp3 -ab 192000 -vn music.mp3
But there's a catch: You have to have ffmpeg and the libavcode-unstripped-52 packages installed on your computer. The problem is that second package is available in the multiverse respository only. To enable the multiverse repository, select Administration from the System menu, then Software Sources.

6 Tips for Optimizing a Native XML Database

IBM DeveloperWorks just published an article of mine: http://www.ibm.com/developerworks/xml/library/x-optxmldb/index.html

RE: Querying s-expressions in Common Lisp

I just found an article titled Querying s-expressions in Common Lisp that Slava Akhmechet posted to defmacro.org last year. (Yes, I know--old news. I have a lot of catching up to do.)

The article got me excited because I am an XQuery programmer and I've always wanted to see something like XPath in Lisp and in Perl. (Thanks Slava!) I've even mentioned this to my peers. But I'm not talking about a library to manipulate, navigate, or query XML.

Quicksort Performance: Comparing Some Lisps And Perl

A few days ago, I wrote a simple Quicksort implementation in Common Lisp. After that, I started to wonder how other lisps and Perl compared for sorting numbers.
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