asOneSidedFormula {stats}

R Documentation

Convert to One-Sided Formula

Description

Names, calls, expressions (first element), numeric values, and character strings are converted to one-sided formulae associated with the global environment. If the input is a formula, it must be one-sided, in which case it is returned unaltered.

Usage

asOneSidedFormula(object)

Arguments

object

a one-sided formula, name, call, expression, numeric value, or character string.

Value

a one-sided formula representing object

Author(s)

José Pinheiro and Douglas Bates

See Also

formula

Examples

(form <- asOneSidedFormula("age"))
stopifnot(exprs = {
    identical(form, asOneSidedFormula(form))
    identical(form, asOneSidedFormula(as.name("age")))
    identical(form, asOneSidedFormula(expression(age)))
})
asOneSidedFormula(quote(log(age)))
asOneSidedFormula(1)

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