validate (version 0.2.6)

variables: Get variable names

Description

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

Usage

variables(x, ...)
# S4 method for rule
variables(x, ...)
# S4 method for list
variables(x, ...)
# S4 method for data.frame
variables(x, ...)
# S4 method for environment
variables(x, ...)
# S4 method for 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

# NOT RUN {
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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