SprottQ¶

Systems / ODEs / Chaotic attractors

Case Q of Sprott's 1994 search for minimal chaotic flows — six terms with a single quadratic nonlinearity.

continuous · ODE3 dimensionschaotic

Interactive: drag to rotate

Definition¶

\[ \begin{aligned} \dot{y_{0}} &= - y_{2} \\ \dot{y_{1}} &= y_{0} - y_{1} \\ \dot{y_{2}} &= a y_{0} + b y_{2} + y_{1}^{2} \end{aligned} \]

Parameters¶

Symbol	Default	Role
`a`	`3.1`	adjustable coefficient
`b`	`0.5`	adjustable coefficient

Properties¶

Lyapunov spectrum

$+0.07035,\; +0.01493,\; -0.5853$
computed at build

Kaplan–Yorke dimension

$D_{KY} = 2.146$

Divergence ∇·f

$\nabla\!\cdot f = b - 1$
constant

Equilibria

1 equilibria
0 stable · 1 unstable

Define it in TSDynamics¶

import tsdynamics as ts

sys = ts.systems.SprottQ()
traj = sys.integrate(final_time=100.0, dt=0.01)

exps = sys.lyapunov_spectrum()
ts.kaplan_yorke_dimension(exps)

Reference¶

Sprott (1994), Phys. Rev. E 50, R647-R650

BibTeX

@misc{sprottq,
  title = {SprottQ system},
  note = {Sprott (1994), Phys. Rev. E 50, R647-R650}
}