recent additions

Thu, 11 Nov 2010

Recursive covariance


How to compute the average, variance, covariance, and correlation of two series in a recursive way. That is, starting with the statistic for N items, how does it change when item N+1 is added?

Computing (co)variances recursively.

posted at: 06:15 | path: /en/science | permanent link

Tue, 01 Jan 2008

Spam '07

Email to this domain in 2007: 64,000 messages; 95% spam.

posted at: 12:18 | path: /en/computers | permanent link

Tue, 07 Nov 2006

Memo to self

Mythtv: remote did not work. Error in /var/log/messages:

could not get file information for /dev/lirc

Makes sense, since it is called /dev/lirc0. Fix: go into /etc/init.d/lircd and put --device=/dev/lirc0 in the startup command.

posted at: 06:49 | path: /en/computers | permanent link

Fri, 21 Apr 2006

Spam fumbles

Failing spam 101:

posted at: 13:17 | path: /en/computers | permanent link

Thu, 09 Mar 2006

Take that, Enigma

So I decided to run this Enigma WWII codebreaker simulation that lets you crack old German submarine messages and guess what: in between recording Spooks and Lost, our *video* decoded one of them:

[knaap@video ~]$ telnet 50000
Connected to (
Escape character is '^]'.
Here you can check if you have submitted a winning result
for the second break (March 7th 2006) of the M4 Project.
Enter your IP address and hit the Return key:
Congratulations! You have submitted a winning result.
Connection closed by foreign host.
posted at: 02:40 | path: /en/computers | permanent link

Wed, 26 Oct 2005


On my commute home, this sign always brings a smile to my face:


The TV-conscious traveller thinks: CTU?!?

And then reads the text next to it.

posted at: 05:47 | path: /en/entertainment/movies_and_tv | permanent link

Thu, 16 Jun 2005


Google scholar (which is great, of course) ascribes a well-known article by Peter Neary to the unknown scholars P. Draft and C. Welcome. I wonder who they are?

from google

Quite productive fellows, it seems.

posted at: 02:42 | path: /en/science | permanent link

Thu, 17 Mar 2005



When I look at the programs that populate my PVR's hard disk, I cannot help but wonder whether my Dutch TV license fee is properly forwarded to the BBC.

posted at: 13:04 | path: /en/entertainment/movies_and_tv | permanent link

Fri, 25 Feb 2005



Wow, since we got DSL my friends at the ISP upped the speed twice. Without asking!

posted at: 13:32 | path: /en/computers | permanent link

Mon, 03 Jan 2005

Popfile stats

emails classified6,875
legit3,127 (45.49%)
spam3,748 (54.51%)
filter accuracy:99.6%

Popfile says: more than half of my email in the second half of 2004 was spam. Up from one third.

posted at: 12:02 | path: /en/computers | permanent link

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