grapes-nin-grapes: Not-In Infix Operator

In infixit: Helpful Additional Infix Functions

Not-In Infix Operator

Description

This tests whether the elements on the left-hand side is not within the elements on the right-hand side. In effect, it is a cleaner, parsimonious way of articulating !(lhs %in% rhs). See the help for match for additional documentation on matching.

Usage

lhs %nin% rhs

Arguments

lhs	The left-hand side, element(s) to be sought in the rhs.
rhs	The right-hand side; element(s) to be compared against the lhs for possible membership.

Details

Following the convention of %in%, which is actually a call to match, ⁠%nin%⁠ is defined as: match(lhs, rhs, nomatch = 0) == 0. (In the case of %in%, the final comparison is ⁠> 0⁠; as it is looking for indices of the location of lhs[i] within rhs, any positive match will be greater than 0 by definition since 'R' is a 1-index language rather than a 0-index language such as, e.g., Python).

Value

Returns a Boolean vector the length of lhs conveying whether each element is unrepresented in the elements of rhs.

Examples

{
 
 "apple" %nin% c("carrot", "kiwi" ,"pear")

}

infixit documentation built on June 8, 2025, 10:52 a.m.