By now, several thousands of packages, compilations of special functions and extensions, can be downloaded from the official Internet platforms for R. Some packages offer more than a thousand functions. Some functions, such as the par() function so important for our topic, can receive more than 80 arguments. At the beginning, a system like this appears as hard to negotiate as a jungle or a maze.
In this book, we will use a very specific selection of those that have shown to be necessary or helpful for the creation of the examples. It is obvious that we cannot give a complete introduction to R; these days, there are a multitude of good books and websites available to do just that.
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