Coercing an Object of mode "list" to mode "call" in R Programming - as.call() Function

Create an Object of mode call in R Programming - call() Function

Last Updated : 19 Jun, 2020

call() function in R Language is used to create or test for objects of mode "call".

Syntax: call(name, ...) Parameters: name: a non-empty character string naming the function to be called ...: arguments to be part of the call

Example 1:

Python3

# R program to illustrate
# call function

# Calling call() function
x <- call("sin", 23)
y <- call("cos", 0)
x
y

# Evaluating values of call
eval(x)
eval(y)

Output:

sin(23)
cos(0)
[1] -0.8462204
[1] 1

Example 2:

Python3

# R program to illustrate
# call function

# Calling call() function
x <- call("round", 10.5)
x 

# Initializing a round character
f <- "round"

# Calling call() function
call(f, quote(A))

Output:

round(10.5)
round(A)

Example 3:

Python3

# R program to illustrate
# call function

# Initializing round value
# without its character
f <- round

# Calling call() function
# which will give an error
# bcs the argument should be
# a character string
call(f, quote(A))

Output:

Error in call(f, quote(A)) : first argument must be a character string
Execution halted

Coercing an Object of mode "list" to mode "call" in R Programming - as.call() Function

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