all.names

0th

Percentile

Find All Names in an Expression

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

Keywords
programming
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.
Details

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

Value

A character vector with the extracted names.

substitute to replace symbols with values in an expression.
library(base) all.names(expression(sin(x+y))) all.names(quote(sin(x+y))) # or a call all.vars(expression(sin(x+y)))