Language - Name (Program Entity) in R.
A name permits to address a value.
An object may have several values and then several names.
For a data.frame or a list, it will be the column header.
You can set and/or get them.
The available names of an object can be found with the names function:
names(x)
where:
The str function gives them also:
str(df)
'data.frame': 5 obs. of 3 variables:
$ colA: int 1 2 3 4 5
$ colB: int 2 3 4 5 6
$ colC: int 3 4 5 6 7
The previous names are not really beautiful, we will change them:
names(df)=c("cond","diff")
> names(df)
[1] "cond" "diff"
example with a list
l = list(name = "Nico", age = 40)
l
$name
[1] "Nico"
$age
[1] 40
> names(l)
[1] "name" "age"
You may use the $ sign to retrieve a named value:
You can access the value by name
l$name
[1] "Nico"
?names