vector_occurrence {oeli}

Find the positions of first or last occurrence of unique vector elements

Description

This function finds the positions of first or last occurrence of unique vector elements.

Usage

vector_occurrence(x, type = "first")

Arguments

x

A vector.

type

Either "first" for the first or "last" for the last occurrence.

Value

An integer vector, the positions of the unique vector elements. The ordering corresponds to unique(x), i.e., the i-th element in the output is the (first or last) occurrence of the i-th element from unique(x).

Examples

x <- c(1, 1, 1, 2, 2, 2, 3, 3, 3)
unique(x)
vector_occurrence(x, "first")
vector_occurrence(x, "last")