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GEISEL.ODE
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1990-01-21
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430b
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# GEISEL.ODE
# T. Geisel, Phys Rev Lett 59, 2503 (1988). A diffusive chaotic system.
# An exquisite example!!
# Plot x vs. y and keep continuing the solution with F7.
# A particle moves in a 2D periodic potential.
# Author claims spectrum is 1/f.
$m 5
$n 500
$t 200
# Particle position is (x,y)
x = 0
y = 0
vx = 1
vy = 0.5
x' = vx
y' = vy
vx' = (1.5+0.5*cos(y))*sin(x)
vy' = (1.5+0.5*cos(x))*sin(y)