r - Remove row-specific items from list -


i create last column ('desired_result') 3 prior columns ('group', 'animal', , 'full'). below code reproducible example.

library(data.table) data = data.table(group = c(1,1,1,2,2,2), animal = c('cat', 'dog', 'pig', 'giraffe', 'lion', 'tiger'), desired_result = c('dog, pig', 'cat, pig', 'cat, dog', 'lion, tiger', 'giraffe, tiger', 'giraffe, lion')) data[, full := list(list(animal)), = 'group'] data = data[, .(group, animal, full, desired_result)]  data     group  animal               full   desired_result 1:     1     cat          cat,dog,pig     dog, pig 2:     1     dog          cat,dog,pig     cat, pig 3:     1     pig          cat,dog,pig     cat, dog 4:     2 giraffe   giraffe,lion,tiger    lion, tiger 5:     2    lion   giraffe,lion,tiger    giraffe, tiger 6:     2   tiger   giraffe,lion,tiger    giraffe, lion

basically, modify 'full' not include corresponding 'animal'. have tried various lapply commands using both list , character versions of these columns have not been able solve problem.

here's possible approach

data[, desired_result := {         temp <- unique(unlist(full))          tostring(temp[-match(animal, temp)])         }, = .(group, animal)] data #    group  animal               full desired_result # 1:     1     cat        cat,dog,pig       dog, pig # 2:     1     dog        cat,dog,pig       cat, pig # 3:     1     pig        cat,dog,pig       cat, dog # 4:     2 giraffe giraffe,lion,tiger    lion, tiger # 5:     2    lion giraffe,lion,tiger giraffe, tiger # 6:     2   tiger giraffe,lion,tiger  giraffe, lion

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