Koopman-theoretic modeling of quasiperiodically driven systems: Example of signalized traffic corridor

S Das, S Mustavee, S Agarwal… - IEEE Transactions on …, 2023 - ieeexplore.ieee.org
This article presents a novel approach to analyzing quasiperiodically driven dynamical
systems. It presents a holistic data-driven framework for reconstructing such a system and …

Finding Birkhoff averages via adaptive filtering

M Ruth, D Bindel - Chaos: An Interdisciplinary Journal of Nonlinear …, 2024 - pubs.aip.org
In many applications, one is interested in classifying trajectories of symplectic maps as
invariant tori, islands, or chaos. Here, we introduce Birkhoff reduced rank extrapolation …

Super convergence of ergodic averages for quasiperiodic orbits

S Das, JA Yorke - Nonlinearity, 2018 - iopscience.iop.org
Super convergence of ergodic averages for quasiperiodic orbits Page 1 Nonlinearity PAPER
Super convergence of ergodic averages for quasiperiodic orbits To cite this article: Suddhasattwa …

Distinguishing between regular and chaotic orbits of flows by the weighted Birkhoff average

N Duignan, JD Meiss - Physica D: Nonlinear Phenomena, 2023 - Elsevier
This paper investigates the utility of the weighted Birkhoff average (WBA) for distinguishing
between regular and chaotic orbits of flows, extending previous results that applied the WBA …

Quantitative quasiperiodicity

S Das, Y Saiki, E Sander, JA Yorke - Nonlinearity, 2017 - iopscience.iop.org
Quantitative quasiperiodicity Page 1 Nonlinearity PAPER Quantitative quasiperiodicity To cite
this article: Suddhasattwa Das et al 2017 Nonlinearity 30 4111 Manuscript version: Accepted …

Resonance and weak chaos in quasiperiodically-forced circle maps

JD Meiss, E Sander - … in Nonlinear Science and Numerical Simulation, 2025 - Elsevier
In this paper, we distinguish between four categories of dynamics for quasiperiodically-
forced (QPF) circle maps: resonant and incommensurate regular dynamics, and strongly and …

Proportions of incommensurate, resonant, and chaotic orbits for torus maps

E Sander, JD Meiss - Chaos: An Interdisciplinary Journal of Nonlinear …, 2025 - pubs.aip.org
This paper focuses on distinguishing classes of dynamical behavior for one-and two-
dimensional torus maps, in particular, between orbits that are incommensurate, resonant …

Data-driven discovery of quasiperiodically driven dynamics

S Das, S Mustavee, S Agarwal - Nonlinear Dynamics, 2024 - Springer
The analysis of a timeseries can provide many new perspectives if it is accompanied by the
assumption that the timeseries is generated from an underlying dynamical system. For …

Reconstructing dynamical systems as zero-noise limits

S Das - arxiv preprint arxiv:2407.16673, 2024 - arxiv.org
A dynamical system may be defined by a simple transition law-such as a map or a vector
field. The objective of most learning techniques is to reconstruct this dynamic transition law …

Discrete-time dynamics, step-skew products, and pipe-flows

S Das - arxiv preprint arxiv:2409.02318, 2024 - arxiv.org
A discrete-time deterministic dynamical system is governed at every step by a
predetermined law. However the dynamics can lead to many complexities in the phase …