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 are shown as follows: " We will use the base graphics function hist()
to make our histogram."
A block of code is set as follows:
hist(air$Nitrogen.Oxides, breaks=20, xlab="Nitrogen Oxide Concentrations", main="Distribution of Nitrogen Oxide Concentrations")
When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:
hist(air$Nitrogen.Oxides,
breaks=20,
xlab="Nitrogen Oxide Concentrations",
main="Distribution of Nitrogen Oxide Concentrations")
New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Select an appropriate mirror site from the CRAN mirror window."