Anita's Fermat Spiral Applet. What is Fermat's spiral?
Fermat's spiral is a special kind of spiral defined by this polar equation: r = ∓√Θ,where r is the radius and Θ is the angle about the center (usually measured from directly rightward). This just means that, as you move out from the center, you shift around by an amount proportional to the square of the amount you moved out. Since the square of a number is slow to increase at first, but gets faster and faster as the number increases, the spiral loops around slowly at first, then gets tighter and tighter.
D'Arbeloff Interactive Math Project. Applets for Neural Networks and Artificial Life. (To Japanese version) Artificial Neural Networks Lab Contents Competitive Learning Vector Quantizer (VQ) Related to hard competitive learning.
(in Japanese) VQ 2 by ELBG algorithm. Sound Draw Applet.