essentials (version 0.1.0)

aslength1: Subset the First Element of a Vector

Description

Subset the first element of a vector.

Usage

aslength1(x)

Arguments

x

vector (or an object which can be coerced) with at least one element.

Value

A vector of length 1.

Details

Vectors of length one return themselves. Vectors of length greater than one return the first element with a warning. Vectors of length zero raise an error. If x is a vector (determined by is.vector), names will be preserved.

Examples

# NOT RUN {
aslength1(1)
aslength1(1:10)
try(aslength1(integer(0)))
# }