jj's useful and ugly pages

Here you find

The FXT algorithm library
Some bit wizardry and algorithms (from FXT)
The (work in progress) book "Matters Computational" (was: "Algorithms for Programmers")
A collection of FFT codes
the HFLOAT package: high precision computations
the arctan page: fine arctan relations for Pi
tables of mathematical data
math links
pari/gp scripts
Links to persons named Jörg Arndt
Yet another hakmem mirror
A pointer to a book on PI=3.1415... German, English translation, there is also a French translation.
Configuration: emacs
Configuration: zsh/bash (plus some scripts)
Configuration: X11 and ctwm
A simple memory benchmark: memxfer
A very useful replace script
Copies of spam emails advertising fake conferences
Things that do not fit elsewhere are in the unsorted section

... but no gifs at all ...

Ugly pages kindly hosted by coresystems
Until March-2006 the pages were hosted by TMT
Thanks goes to both teams!

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please: DO report broken links !

contacting me

Send useful email to

jj (Jörg Arndt)

< arndt (AT) jjj (DOT) de >

Please use a meaningful subject for your email. Don't make me guess what you mean. I prefer ascii over html format.
I read my mail two times a week, likely on two consecutive days.

Due to the insane amount of SPAM I receive I have to use mail filtering (via procmail/spamassassin). I use a three stage scheme: valid-looking (inbox), may-be-spam (first spam folder) and likely-spam (automatically discarded). I browse the mail in the spam folder but the chances I miss a valid mail there is higher than with mail in my inbox. Mail in html format tends to go to the spam folder.

Last modified 2010-June-01 (10:00)

A last cite about my pages:
Auf Deiner Homepage war ich auch schon. Langweilst Du Dich eigentlich sehr? Ich kann mir nichts anderes vorstellen, denn wer soviel Geduld aufbringt eine solche Schwachsinnspage zu erschaffen muß sich einfach langweilen.
Gruß, Petra