Create a list of named lists from three vectors in R

Question

I'm trying to combine three vectors into a list of lists, with one vector being the indexes for the list.

Given

names<-c("a","b","c","d")
id1<-c(1,1,2,2)
id2<-c(3,4,5,6)

I would like to build a list looking like this:

mylist <- list("a" = list(1,3), "b" = list(1,4), "c" = list(2,5), "d" = list(2,6))

Answer 1

I think you are looking for Map

l <- Map(list, id1, id2) # thanks to @thelatemail for suggested improvement
names(l) <- names
identical(mylist, l)
# TRUE