r - How to turn quoted string input into value of a vector? -

i accept input user in format such as:

arg_from_user = "c(1,2,3)" 

and assign content of string vector, such that:

vector = mystery_function(arg_from_user)  vector [1] 1 2 3 

what use in place of mystery_function?

you try

eval(parse(text="c(1,2,3)"))