In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.
Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "We have used the
png() function to save the plot as a PNG."
Any command line code is written as:
k = matrix((1:4),2,2) l = matrix((5:10),2,3) dim(k) dim(l)
In R it is a general practice to use
<- for assignment instead of the
= sign. In all the recipes, I have followed the
= sign for assignment. You should note that if you refer to blogs or websites related to R, you may encounter the
<- sign ...