Before we start any serious programming in R, we need to learn how to import data into an R environment and which data types R supports. Often, for a particular analysis, we will not use the entire dataset. Therefore, we need to also learn how to select a subset of the data for any analysis. This section will cover these aspects.
The default representation of numbers in R is double precision real number (numeric). If you want an integer representation explicitly, you need to add the suffix
L. For example, simply entering
1 on the command prompt will store
1 as a numeric object. To store
1 as an integer, you need to enter
1L. The command
class(x) will give the class (type) of the object
x. Therefore, entering
class(1) on command prompt will give the answer
numeric whereas entering
class(1L) will give the answer
R also has a special number
Inf that represents...