Various code snipplets below are all under BSD-license, so you can integrate them in any commercial project. We would appreciate if you send us back any bug fixes or extensions. We will mention your contribution on this page.

If you have any questions email armin_at_spam_sux_approximity.com or stefan_at_spam_sux_approximity.com.

Ruby hack to get a linux standard printer to print windows stuff

Stefan's daughter Helena complained that she can't print out any pictures on the windows notebook, as only his linux box has a printer attached (no network printing configured). Therefore the following script allows to forward the stuff to a standard printer. Only set up a ps-printer with raw-connection on the windows box and set the correct IP and port in the script. Version 0.02 can listen on a vmware ip-address -- which first needs to configured manually (depending on what ifconfig says about vmnet).

printerproxy.rb (Version: 0.02) last changes: 15/01/2003

Ruby code for Cholesky Decomposition

If certain conditions are met, one can write a matrix A as A=L * transpose(L). The code below works out L. If the code fails, check first whether your matrix can be Cholesky decomposed using real numbers only.

Download code and tests: Cholesky (Version: 0.01) last changes: 12/24/02