Section 15 Atomic Class: Summary

15.1 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', '1', 'one'
logical	Logical	a <- 3 > 4, T/F, TRUE/FALSE
complex	Complex	3 + 4i
raw	Raw	raw(5)

15.2 Points to note

• Function to identify the object type: class, typeof, mode

• Other functions to check the object type: is.integer, is.double, is.logical, is.character

• The complex numbers consist of a real part and an imaginary part, which is identified by lower-case i

• The raw vector stores raw bytes of data. Each raw byte is represented by a two-digit hexadecimal value. They are primarily used for storing the contents of imported binary files, and as such are reasonably rare.

• Function is.vector tests whether an object is an atomic vector. It returns TRUE if the object is an atomic vector and FALSE otherwise.

• You can make an atomic vector with just one value. R saves single value as an atomic vector of length 1

• length returns the length of an atomic vector