Context: Peak to Peak Dynamics: A Critical Survey. International Journal of Bifurcation and Chaos, vol. 10, no. 08.
mymax: Collects the maxima of a given time series.
mymin: Collects the minima of a time series.
peng: Simulates the model of a chemical process (used to illustrate PPD analysis).
plotppd: Generates both the Peak-to-Peak Plot and the Return-Times Plot for a given time series.
pubbl: Simulates another model used as illustration.