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I don't know how to make a list of lists in R. I have several lists, I want to store them in one data structure to make accessing them easier. However, it looks like you cannot use a list of lists in R, so if I get list l1 from another list, say, l2 then I cannot access elements l1. How can I implement it?
EDIT- I will show an example of what does not work for me:
list1 <- list() list1[1] = 1 list1[2] = 2 list2 <- list() list2[1] = 'a' list2[2] = 'b' list_all <- list(list1, list2) a = list_all[1] a[2] #[[1]] #NULL but a should be a list!
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The list is one of the most versatile data types in R thanks to its ability to accommodate heterogenous elements. A single list can contain multiple elements, regardless of their types or whether these elements contain further nested data. So you can have a list of a list of a list of a list of a list …
How to Create Lists in R? We can use the list() function to create a list. Another way to create a list is to use the c() function. The c() function coerces elements into the same type, so, if there is a list amongst the elements, then all elements are turned into components of a list.
To add or append an element to the list in R use append() function. This function takes 3 parameters input list, the string or list you wanted to append, and position. The list. append() function from the rlist package can also use to append one list with another in R.
You can easily make lists of lists
list1 <- list(a = 2, b = 3) list2 <- list(c = "a", d = "b") mylist <- list(list1, list2) mylist is now a list that contains two lists. To access list1 you can use mylist[[1]]. If you want to be able to something like mylist$list1 then you need to do somethingl like
mylist <- list(list1 = list1, list2 = list2) # Now you can do the following mylist$list1 Edit: To reply to your edit. Just use double bracket indexing
a <- list_all[[1]] a[[1]] #[1] 1 a[[2]] #[1] 2 Using your example::
list1 <- list() list1[1] = 1 list1[2] = 2 list2 <- list() list2[1] = 'a' list2[2] = 'b' list_all <- list(list1, list2) Use '[[' to retrieve an element of a list:
b = list_all[[1]] b [[1]] [1] 1 [[2]] [1] 2 class(b) [1] "list" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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