all.names {base}
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.
-1indicates no limit (other than vector size limits). - unique
- a logical value which indicates whether duplicate names should be removed from the value.
Details
These functions differ only in the default values for their arguments.
Values
A character vector with the extracted names.
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)))
Documentation reproduced from R 3.0.1. License: GPL-2.