extract_all_names: Extract all names

In spdesign: Designing Stated Preference Experiments

Extract all names

Description

Extracts all parameter and attribute names from the utility function. This is a wrapper around str_extract_all with a specified boundary. The function also calls remove_all_brackets to ensure that if a word is used inside a square bracket, e.g. seq, it is not extracted.

Usage

extract_all_names(string, simplify = FALSE)

Arguments

string	A character string
simplify	If TRUE return as a vector. Default is FALSE.

Details

A name is a word that starts with a letter and is not followed by an opening round bracket. This avoids extracting numbers, e.g. the 2 in I(x1^2), and functions such as the interaction operator I() as attributes.

Value

A list or vector with all names

spdesign documentation built on Oct. 6, 2026, 9:07 a.m.