R: Names Attribute of an object

All objects can have names, these are used to write readable code, “names()” function is used to set names to an object.

Setting names to elements of vector

> age <- c(25, 27, 29)
> names(age)
NULL
> 
> names(age) <- c("Hari Krishna", "Rama Krishna", "Joel")
> 
> age
Hari Krishna Rama Krishna         Joel 
          25           27           29 

In the above example, I given a name to each elements in the vector age.

         25 – Hari Krishna

         27 – Rama Krishna

         29 -  Joel

After setting names, when you print the vector age, it displays names over the members of the vector age.

Setting names to elements of list

> age <- list(Hari=25, Rama=27, Joel=26)
> age
$Hari
[1] 25

$Rama
[1] 27

$Joel
[1] 26

When I print list age, it prints names and value associated with the name.

Setting names to matrices

We can set names to columns and rows of a matrix.

> matrix1 <- matrix(1:4, nrow=2, ncol=2)
>
> dimnames(matrix1) <- list(c("row1", "row2"), c("col1", "col2"))
>
> matrix1
     col1 col2
row1    1    3
row2    2    4

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