R Data Types
In programming, data type is an important concept.
Variables can store data of different types, and different types can do different things.
In R, variables do not need to be declared with any particular type, and can even change type after they have been set:
my_var <- "Sally" # my_var is now of type character (aka string)
R has a variety of data types and object classes. You will learn much more about these as you continue to get to know R.
Basic Data Types
Basic data types in R can be divided into the following types:
numeric- (10.5, 55, 787)
integer- (1L, 55L, 100L, where the letter "L" declares this as an integer)
complex- (9 + 3i, where "i" is the imaginary part)
character(a.k.a. string) - ("k", "R is exciting", "FALSE", "11.5")
logical(a.k.a. boolean) - (TRUE or FALSE)
We can use the
class() function to check the data type of a variable:
x <- 10.5
x <- 1000L
x <- 9i + 3
x <- "R is exciting"
x <- TRUE
You will learn much more about the individual data types in the upcoming chapters.