Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

jan_price = c(10, 20, 30)
increase = c(1, 2, 3)
mar_price = jan_price + increase

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

 # 6th element in the Polygons slot of map_bd
sixth_element = map_bd@polygons[[6]]
# make it succinct with max.level = 2 in str() for the 6th element of the
bd@Polygons
str(sixth_element, max.level = 2)

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."