Methods for "[": Extraction or Subsetting in Package 'arules'
Methods for "["
, i.e., extraction or subsetting in package
arules. Subsetting can be done by integers containing column/row
numbers, vectors of logicals or strings containing parts of item labels.
signature(x = "itemMatrix", i = "ANY", j = "ANY", drop= "ANY")
; extracts parts of an itemMatrix
.
The first argument selects rows (e.g., transactions or rules)
and the second argument selects columns (items).
Either argument can be omitted to select all rows or columns.
signature(x = "itemsets", i = "ANY", j = "ANY", drop= "ANY")
; extracts a subset of itemsets and the associated quality measures.
j
has to be missing.
signature(x = "rules", i = "ANY", j = "ANY", drop= "ANY")
; extracts a subset of rules and the associated quality measures.
j
has to be missing.
signature(x = "transactions", i = "ANY", j = "ANY", drop= "ANY")
; extracts a subset of transactions/items from a transactions object
(a binary incidence matrix).
i
and j
can be numeric where
i
selects transactions and
j
selects items.
signature(x = "tidLists", i = "ANY", j = "ANY", drop= "ANY")
; extracts parts (transaction ID vectors) from tidLists
.
i
selects the items or itemsets
and j
selects transactions in the lists.
Michael Hahsler
data(Adult) Adult ## select first 10 transactions Adult[1:10] ## select first 10 items for first 100 transactions Adult[1:100, 1:10] ## select the first 100 transactions for the items containing ## "income" or "age=Young" in their labels Adult[1:100, c("income=small", "income=large" ,"age=Young")]
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