variables {validate}

R Documentation

Get variable names

Description

Generic function that extracts names of variables ocurring in R objects.

Usage

variables(x, ...)

## S4 method for signature 'rule'
variables(x, ...)

## S4 method for signature 'list'
variables(x, ...)

## S4 method for signature 'data.frame'
variables(x, ...)

## S4 method for signature 'environment'
variables(x, ...)

## S4 method for signature 'expressionset'
variables(x, as = c("vector", "matrix", "list"), dummy = FALSE, ...)

Arguments

x	An R object
...	Arguments to be passed to other methods.
as	how to return variables: 'vector' Return the uniqe vector of variables occurring in x. 'matrix' Return a boolean matrix, each row representing a rule, each column representing a variable. 'list' Return a named list, each entry containing a character vector with variable names.
dummy	Also retrieve transient variables set with the := operator.

Methods (by class)

• rule: Retrieve unique variable names

• list: Alias to names.list

• data.frame: Alias to names.data.frame

• environment: Alias to ls

• expressionset: Variables occuring in x either as a single list, or per rule.

See Also

Other expressionset-methods: as.data.frame,expressionset-method, as.data.frame(), created(), description(), label(), meta(), names<-,rule,character-method, origin(), plot,validator-method, summary(), voptions()

Other expressionset-methods: as.data.frame,expressionset-method, as.data.frame(), created(), description(), label(), meta(), names<-,rule,character-method, origin(), plot,validator-method, summary(), voptions()

Examples

Run examples

v <- validator(
  root = y := sqrt(x)
 , average = mean(x) > 3
 , sum = x + y == z
)
variables(v)
variables(v,dummy=TRUE)
variables(v,matrix=TRUE)
variables(v,matrix=TRUE,dummy=TRUE)

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