[R] converting a class dataframe (chars) to transaction class

[Giorgio Garziano]

mydf <- data.frame(d1 = LETTERS[1:10], d2 = letters[11:20])

> str(mydf)
'data.frame':   10 obs. of  2 variables:
$ d1: Factor w/ 10 levels "A","B","C","D",..: 1 2 3 4 5 6 7 8 9 10
$ d2: Factor w/ 10 levels "k","l","m","n",..: 1 2 3 4 5 6 7 8 9 10
>

library(arules)
trans1 <- as(mydf, "transactions")


> trans1
transactions in sparse format with
10 transactions (rows) and
20 items (columns)

> str(trans1)
Formal class 'transactions' [package "arules"] with 3 slots
  ..@ data       :Formal class 'ngCMatrix' [package "Matrix"] with 5 slots
  .. .. ..@ i       : int [1:20] 0 10 1 11 2 12 3 13 4 14 ...
  .. .. ..@ p       : int [1:11] 0 2 4 6 8 10 12 14 16 18 ...
  .. .. ..@ Dim     : int [1:2] 20 10
  .. .. ..@ Dimnames:List of 2
  .. .. .. ..$ : NULL
  .. .. .. ..$ : NULL
  .. .. ..@ factors : list()
  ..@ itemInfo   :'data.frame': 20 obs. of  3 variables:
  .. ..$ labels   : chr [1:20] "d1=A" "d1=B" "d1=C" "d1=D" ...
  .. ..$ variables: Factor w/ 2 levels "d1","d2": 1 1 1 1 1 1 1 1 1 1 ...
  .. ..$ levels   : Factor w/ 20 levels "A","B","C","D",..: 1 2 3 4 5 6 7 8 9 10 ...
  ..@ itemsetInfo:'data.frame': 10 obs. of  1 variable:
  .. ..$ transactionID: chr [1:10] "1" "2" "3" "4" ...>


Reference:

http://www.inside-r.org/packages/cran/arules/docs/transactionInfo


--

Best,

GG

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