arr2dl: Convert a structured character array to double list
Description
Convert a structured character array to a double list. All character elements in array will be splited by
a specific pattern then sorted intrinsically in each layer of the double list.
#Write the column names of datatest into a array:arr <- dl2arr(chrvec2dl(colnames(datatest)))
#Recover the double list from character array:arr2dl(arr)