| all.names {base} | R Documentation |
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. |
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.
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)))
[Package base version 4.4.1 Index]