The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe

Question

There are two different methods for accessing the element of a list or data frame- [ ] and [[ ]] , what is the difference between them? When should I use one over the other and what’s the difference between them? Select the correct answer from above options

Answer 1

The main difference between these two are, mainly Double brackets accesses a list element whereas a single element gives back a list with a single element. E.x. lst <- list('one','two','three') q <- lst[1] class(q) ## returns "list" q <- lst[[1]] class(q) ## returns "character" Hope this helps.