the-book-of-r-exercises Selected exercises from The Book of R, Tilman M. Davies, No Starch Press, ISBN 978-1-59327-651-5. Index of Exercises 3. Matrices and Arrays 3.1 3.2 3.3 4. Non-numeric values 4.1 4.2 4.3 4.5 5. Lists and Dataframes 5.2