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Get the List of Arguments of a Function in R Programming – args() Function

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args() function in R Language is used to get the required arguments by a function. It takes function name as arguments and returns the arguments that are required by that function.
Syntax: args(name) Parameters: name: Function name Returns:
  • For a closure: Formal Argument list but with NULL body
  • For a Primitive Function: A closure with usage and a NULL body
  • For a non-function: NULL in case of not a function.
Example 1:
# R program to get arguments of a function
  
# Calling args() Function
args(append)
args(sin)
args(paste)

                    
Output:
function (x, values, after = length(x)) 
NULL
function (x) 
NULL
function (..., sep = " ", collapse = NULL) 
NULL
Example 2:
# R program to get arguments of a function
  
# Calling args() Function
args(1)
args(10)

                    
Output:
NULL
NULL
The above code returns NULL because the names passed to args() function are not actual functions.

Last Updated : 12 Jun, 2020
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