subset - Passing empty index in R

Question

Say I want to subset a vector a, I can pass the value of the indices to subset in a variable e.g. a[idx].

What value should I set idx to get the equivalent of getting the whole a ( i.e. a[] ) ?

Basically I have a function with idx as the argument, and would like to pass a value to process the whole dataset. I'm assuming there should be something better than 1:length(a).

Answer 1

You can use a small hack: Setting idx to TRUE

a[TRUE]