2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/80371Recurrence plot is a quite easy tool to be used in time series analysis,in particular for measuring unstable periodic orbits embedded in a chaotic dynamical system. Recurrence quantified analysis (RQA) is an advance tool that allows the study of intrinsic complexity of dynamical system with a set of few parameters. We use RQA for measuring chaotic transitions of NADH chemical reaction and determine numerically its characteristic parameters such as: Correlation integral, information entropy, Maximal Lyapunov's exponent, etc. For this work we have developed command sets with performance better than TISEAN package11 pages, 6 figuresChaotic Dynamicstext