In this book, you will find a number of text styles 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: "This chapter covers basic aspects of three of them: ggplot2,plotly, and ggvis."
A block of code is set as follows:
> install.packages(c('devtools','plotly','ggvis'))
> devtools::install_github('hadley/ggplot2')
New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Open your RStudio, go to Tools | Install Packages..."
Warnings or important notes appear like this.
Tips and tricks appear like this.
