Many students spend hours making cartoon graphs of circadian rhythms. Recently I had a request for an R script to make a cartoon of a circadian rhythm modelled on a sine curve.
See the attached file for a quick R script for modelling a circadian rhythm of a heart QT interval rhythm – feel free to modify as you see fit.
I have added in a few explanations for placing text and lines on an R graph for those not familiar with modifying base R graphs.
Comparative chronomics 