X-S Zhang and F Vivaldi, Small pertubations of a discrete twist map, Ann. Inst. Henry Poincare 68 (1998) 507-523.

Round-off problem: plots

N=25	N=32	N=79	golden mean rot #

Round-off problem: software

Library	Maple wksh

Talks

PWI Near-rational

Local model

h=0	h=1/2	h=1/2 detail	h=1/3	h=1/3 detail
h=[0,1,1,1...]	h=[0,2,1,1...]	h=[0,3,1,1...]	h=[0,2,2,2...]	h=[0,4,4,4...]	h=[0,11,11,11...]