Having done a reasonable job of introducing the basic syntax of the R programming language, the book then lurches into some rather advanced and specialist subjects, for example dedicating a whole section to algorithms for generating random numbers (for an introductory text, you would probably just want to know about the rnorm function).
If you are interested in Monte Carlo simulation or numerical optimisation using the R language, this is the book for you. Readers hoping to learn to use R to perform standard statistical testing will be disappointed.