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. 2023 Feb 7;10:79. doi: 10.1038/s41597-023-01978-7

Table 3.

Detailed characteristics of the non-chaotic, quasi-periodic signals.

Symbol Properties Sample signal Sample phase portrait
QPS_145 Name Quasi-periodic 1 Fig. 21 Fig. 22
Class quasi-periodic Dim  1
Params ω1 = π
Init. cond. x0 = 2π, Tmax = 1000
State eqn. x=cos(ω1t/50+x0)+cos(t/50+x0)
Descr. Irrational ω ratio: ω1/ω2 = π
QPS_246 Name Quasi-periodic 2 Fig. 23 Fig. 24
Class quasi-periodic Dim  1
Params ω1=(1+5)/2
Init. cond. x0 = 2π, Tmax = 1000
State eqn. x=sin(ω1t/15+x0)+sin(t/15+x0)
Descr. Irrational ω golden ratio: ω1/ω2=φ=(1+5)/2
QPS_347 Name Quasi-periodic 3 Fig. 25 Fig. 26
Class quasi-periodic Dim  1
Params ω1 = e = 2.71828…
Init. cond. x0 = 2π, Tmax = 1000
State eqn. x=sin(ω1t/15+x0)+cos(t/15+x0)
Descr. Irrational ω ratio: ω1/ω2 = e = 2.71828…