This custom operator returns TRUE if the element on the left-hand side of the operator is not found
in the vector on the right-hand side when using the %in% operator. Otherwise, it returns FALSE.
Usage
x%!in%y
Arguments
x
The element to be tested for absence in the vector.
y
The vector in which to search for the element.
Value
TRUE if the element is not found in the vector, otherwise FALSE.
