Odtnhj

I have a list of n vectors. I would like to split it to sub-list where the number of the vectors at each list is different. The number of the vectors is increased sequentially from one list to another. For example,
if I have a list with 6 vectors. Then, I would like to split it to several list as follows:

The first list contains one vector. Then, the second list contains 2 vectors and so on. For example,

Suppose I have the list x as follows:

x <- list(x1=c(1,2,3), x2=c(1,4,3), x3=c(3,4,6), x4=c(4,8,4), x5=c(4,33,4), x6=c(9,6,7))

Then, I would like to split it into 3 lists,

list1 = x1
list2 = list(x2, x3)
list3 = list(x4,x5, x6)

I have similar question (How to splitting a list of vectors to small lists in decreasing order in r) but in a decreasing order.

How I can generate it to arbitrary number of vectors. For example, how if I have 10 or 20 vectors?

Any idea, please?

I'd stick them all in a list of lists

MyLists <- list()
i <- 1
for (inc in 1:3)
 MyLists[[inc]] <- x[i:(i+inc-1)]
 i <- i+inc

Now MyLists[[1]] is list1, etc.

Building off farnsy's answer, If you need each list in a separate indexed list in the global environment you could do something like this.

#your Stater list
x <- list(x1=c(1,2,3), x2=c(1,4,3), x3=c(3,4,6), 
 x4=c(4,8,4), x5=c(4,33,4), x6=c(9,6,7))


#using a paste parse eval approach to evaluate a string
i<-1
for(inc in 1:3)
 eval(parse(text =
 paste0("list", inc, "<-list(",
 paste0("x$",names(x)[i:(i+inc-1)],collapse = ","),
 ")")
 ))

 i <- i+inc