r - How to Group lists within a list of vectors -


i have list of 7 vectors, group lists 4 lists of vectors each. 

b2 <- list ( c (12 , 47 ,137 ,170), c(44 , 47 ,135, 170) , c(12 , 28 , 34 , 44 , 47 , 59 , 61 , 67 , 76 , 80 , 84 ,135, 148, 170) , c(44 , 47 , 84 ,135 ,170) , c(12 , 28 , 34 , 44 , 47 , 59 , 61 , 67 , 76 , 80 , 84 ,135, 148, 156, 159, 164, 170) , c(12 , 28 , 34 , 44 , 47 , 84 ,135 ,170) , c(12 , 28 , 44 , 47 , 84, 135, 170))   # create 4 groups (lists) per following index of consecutive list sequence)      subgroup <- c(2,4,5,7)  # desired output    b2 <- list ( list ( c (12 , 47 ,137 ,170), c(44 , 47 ,135, 170)) , list ( c(12 , 28 , 34 , 44 , 47 , 59 , 61 , 67 , 76 , 80 , 84 ,135, 148, 170) , c(44 , 47 , 84 ,135 ,170)) , list ( c(12 , 28 , 34 , 44 , 47 , 59 , 61 , 67 , 76 , 80 , 84 ,135, 148, 156, 159, 164, 170)) , list ( c (12 , 28 , 34 , 44 , 47 , 84 ,135 ,170) , c(12 , 28 , 44 , 47 , 84, 135, 170)))

using split , rep:

split(b2, rep(1:length(subgroup), diff(c(0, subgroup))))

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