R: Extract Names from a formula

Names.formula {nlme}

R Documentation

Extract Names from a formula

Description

This method function returns the names of the terms corresponding to the right hand side of object (treated as a linear formula), obtained as the column names of the corresponding model.matrix.

Usage

## S3 method for class 'formula'
Names(object, data, exclude, ...)

Arguments

`object`	an object inheriting from class `formula`.
`data`	an optional data frame containing the variables specified in `object`. By default the variables are taken from the environment from which `Names.formula` is called.
`exclude`	an optional character vector with names to be excluded from the returned value. Default is `c("pi",".")`.
`...`	some methods for this generic require additional arguments. None are used in this method.

Value

a character vector with the column names of the model.matrix corresponding to the right hand side of object which are not listed in excluded.

Author(s)

Jose Pinheiro and Douglas Bates bates@stat.wisc.edu

Examples

Names(distance ~ Sex * age, data = Orthodont)

[Package nlme version 3.1-104 Index]