When creating a function in R, we usually specify the number of argument like
function(x,y){
}
That means it takes only two arguments. But when the numbers of arguments are not specified (For one case I have to use two arguments but another case I have to use three or more arguments) how can we handle this issue? I am pretty new to programming so example will be greatly appreciated.
When you call a function in JavaScript, you can pass in any number of arguments, regardless of what the function declaration specifies. There is no function parameter limit.
In mathematics and in computer programming, a variadic function is a function of indefinite arity, i.e., one which accepts a variable number of arguments.
Except for functions with variable-length argument lists, the number of arguments in a function call must be the same as the number of parameters in the function definition. This number can be zero. The maximum number of arguments (and corresponding parameters) is 253 for a single function.
d <- function(...){
x <- list(...) # THIS WILL BE A LIST STORING EVERYTHING:
sum(...) # Example of inbuilt function
}
d(1,2,3,4,5)
[1] 15
You can use ...
to specify an additional number of arguments. For example:
myfun <- function(x, ...) {
for(i in list(...)) {
print(x * i)
}
}
> myfun(4, 3, 1)
[1] 12
[1] 4
> myfun(4, 9, 1, 0, 12)
[1] 36
[1] 4
[1] 0
[1] 48
> myfun(4)
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