validate (version 0.1.4)

variables: Extract variable names

Description

Extract variable names

Usage

variables(x, ...)
## S3 method for class 'rule':
variables(x, ...)
## S3 method for class 'list':
variables(x, ...)
## S3 method for class 'data.frame':
variables(x, ...)
## S3 method for class 'environment':
variables(x, ...)
## S3 method for class '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 vari

item

dummy

code

:=

Methods (by class)

• rule: Retrieve unique variable names
• list: Alias tonames.list
• data.frame: Alias tonames.data.frame
• environment: Alias tols
• expressionset: Variables occuring inxeither as a single list, or per rule.

See Also

• names,expressionset-method,length,expressionset-method

description, label, created, origin

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)