Find All Names in an Expression
Return a character vector containing all the names which occur in an expression or call.
all.names(expr, functions = TRUE, max.names = -1L, unique = FALSE)all.vars(expr, functions = FALSE, max.names = -1L, unique = TRUE)
- an expression or call from which the names are to be extracted.
- a logical value indicating whether function names should be included in the result.
- the maximum number of names to be returned.
-1indicates no limit (other than vector size limits).
- a logical value which indicates whether duplicate names should be removed from the value.
These functions differ only in the default values for their arguments.
A character vector with the extracted names.
substitute to replace symbols with values in an expression.
all.names(expression(sin(x+y))) all.names(quote(sin(x+y))) # or a call all.vars(expression(sin(x+y)))
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