base (version 3.3)

all.names: Find All Names in an Expression

Description

Return a character vector containing all the names which occur in an expression or call.

Usage

all.names(expr, functions = TRUE, max.names = -1L, unique = FALSE)
all.vars(expr, functions = FALSE, max.names = -1L, unique = TRUE)

Arguments

expr

an expression or call from which the names are to be extracted.

functions

a logical value indicating whether function names should be included in the result.

max.names

the maximum number of names to be returned. -1 indicates no limit (other than vector size limits).

unique

a logical value which indicates whether duplicate names should be removed from the value.

Value

A character vector with the extracted names.

Details

These functions differ only in the default values for their arguments.

See Also

substitute to replace symbols with values in an expression.

Examples

all.names(expression(sin(x+y)))
all.names(quote(sin(x+y))) # or a call
all.vars(expression(sin(x+y)))