Welcome to Gratrix.net

Gratrix.net is the home page of Sam Gratrix.

>>>>>> Find out about me

I hope you enjoy it here, and if there is anything thing you would like to talk to me about, please email me.


My best photograph from each castle I have visited, along with some very brief notes pinched from the guide books, plaques, etc. I have recently given this a big redesign and added Google Map interaction.

>>>>>> To The Castles

Uniform Tilings

Interactive uniform tilings in spherical, Euclidean and hyperbolic geometries by Wythoffian construction. Note that this work is far from finished.

>>>>>> Uniform Tilings


Some of my better pictures, including birds and prey and motorsport.

>>>>>> Photography


I have been tracing my family history for some time now. The first link gives information I have regarding the name Gratrix and an overview of my Gratrix line. The second link is to a detailed dynamic web page presenting my family tree findings.

>>>>>> Gratrix Name Genealogy
>>>>>> My Family Tree


The odds of a few lotteries from around the world are presented, where all computations are performed by your browser using rational arithmetic. A short exposition on lottery mathematics is also given.

>>>>>> Lottery Odds
>>>>>> Lottery Mathematics


(pic to follow)

In the spring of 2007 I was rushed to hospital with heart palpitations and diagnosed with Wolff-Parkinson-White, a condition associated with a risk of sudden death. Thanks to Keyhole heart surgery to remove an electrical short circuit in my heart, I now no longer have the condition.

>>>>>> My Wolff-Parkinson-White Moment


Lots of pictures generated by the The Persistence of Vision Raytracer of quite beautiful polyhedra. An OpenGL visualisation program (made some time ago) is also available for free.

>>>>>> To The Polyhedra

Now That's What I Call Music!

A page dedicated to the popular Now That's What I Call Music! compilation series that has been running since 1983.

Please note this page is due to be rewritten.

>>>>>> To The Now Music

Foosball ELO Rankings

A group of friends and I play Foosball, aka Table Football. We record the results and compute ELO rankings to see how we're doing.

>>>>>> Interactive Foosball Rankings


Chaotic-Motion.com is another site developed by me and is dedicated to a small group of friends who take part in online races. Our racing simulator of choice is Live For Speed, a quite realistic simulator in terms of car dynamics.

>>>>>> Chaotic-Motion.com

Top Snaps

Here I present some of the best photos I have taken. Please feel free to use them for your desktop wallpaper, but for other uses please ask me first.

>>>>>> To The Top Snaps

Auto 97

Notes to get the Auto continuation and bifurcation package working in Windows.

Please note that this page is no longer maintained, but as it may still be useful I have kept it online.

>>>>>> To Auto 97