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Do I need to initialize each level of a multi-level list in R?
l=list()
l[["top"]]=list()
l[["top"]][["mid"]]=list()
l[["top"]][["mid"]][["low_key_1"]]="key_1_val"
or is possible to apply some auto-initialization like on perl?
You need to initialize each level, but you can do it with one command.