form_pred {rsample}

Extract Predictor Names from Formula or Terms

Description

all.vars returns all variables used in a formula. This function only returns the variables explicitly used on the right-hand side (i.e., it will not resolve dots unless the object is terms with a data set specified).

Usage

form_pred(object, ...)

Arguments

object

A model formula or stats::terms() object.

...

Arguments to pass to all.vars()

Value

A character vector of names

Examples

form_pred(y ~ x + z)
form_pred(terms(y ~ x + z))

form_pred(y ~ x + log(z))
form_pred(log(y) ~ x + z)

form_pred(y1 + y2 ~ x + z)
form_pred(log(y1) + y2 ~ x + z)

# will fail:
# form_pred(y ~ .)

form_pred(terms(mpg ~ (.)^2, data = mtcars))
form_pred(terms(~ (.)^2, data = mtcars))