5 Data Type

5.1 R atomic class

Class	Concept	Example
`integer`	Integer	`1L; -5L`
`double`	Double	`1.0; 3.14; 5.3E-12; 22/7`
`character`	Character	`'a'; 'A'; 'Sam'; 'David'; '2'; 'This is a character variable'`
`logical`	Logical	`a = 3 > 4; T; F; TRUE; FALSE; True; False`

`typeof, class`	Find type (class) of variable	`typeof(x); typeof(y); class(z); class(z)`
`is.integer`	Boolean check: integer	`is.integer(x)`
`is.double`	Boolean check: double	`is.double(x)`
`is.character`	Boolean check: character	`is.character(x)`
`is.logical`	Boolean check: logical	`is.logical(x)`

x = 5L; y = 5.3; z = 'Sam'; w = TRUE

typeof(x); typeof(y); typeof(z); typeof(w)

[1] “integer” [1] “double” [1] “character” [1] “logical”

class(x); class(y); class(z); class(w)

[1] “integer” [1] “numeric” [1] “character” [1] “logical”

Type	Concept	Example
`int`	Integer	`1L; -5L`
`float`	Double	`1.0; 3.14; 5.3E-12; 22/7`
`str, chr`	Character	`'a'; 'A'; 'Sam'; 'David'; '2'; 'This is a string variable'`
`bool`	Logical	`a = 3 > 4; True; False`

`type`	Find type of variable	`type(x); type(y); type(z); type(z)`
`is.instance`	Boolean check: integer	`is.instance(x, int)`
	Boolean check: float	`is.instance(x, float)`
	Boolean check: string	`is.instance(x, str)`
	Boolean check: boolean	`is.instance(x, bool)`


x = 5; y = 5.3; z = 'Sam'; w = True

type(x); type(y); type(z); type(w)