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formula.tools (version 1.5.4)

get.vars: Get variable (names) from various R objects

Description

get.vars extracts variable names from various R objects such as formulas, expressions, calls, symbols, etc. It is very similar to all.vars except that all symbols, etc. are interpolated to the names of variables.

Usage

get.vars(x, data = NULL, ...)


"get.vars"(x, data = NULL, ...)


"get.vars"(x, data = NULL, ...)


"get.vars"(x, data = NULL, ...)


"get.vars"(x, data = NULL, ...)


"get.vars"(x, data = NULL, ...)


"get.vars"(x, data = NULL, ...)


lhs.vars(x, ...)


.lhs.vars(x, ..., data = NULL)


"lhs.vars"(x, ..., data = NULL)


"lhs.vars"(x, ..., data = NULL)


"lhs.vars"(x, ...)


rhs.vars(x, ...)


.rhs.vars(x, ..., data = NULL)


"rhs.vars"(x, ..., data = NULL)


"rhs.vars"(x, ..., data = NULL)


"rhs.vars"(x, ...)

Arguments

x
object to extract vars from.
data
data set/list or environment on which the names are defined
...
arguments passed to subsequent functions

get.vars and variant get the variables from objects optionally interpreting on . on the data. This is useful, for example, when you wish to know what data is used based on a given formula.

Methods/functions beginning with . are not exported

Value

character vector of variables names in order that they appear in x.

See Also

all.vars

Examples

Run this code
get.vars( Species ~ ., iris )
  get.vars( quote( Sepal.Length * Sepal.Width ), iris )

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