R/supportingTransactions.R

In arules: Mining Association Rules and Frequent Itemsets

#######################################################################
# arules - Mining Association Rules and Frequent Itemsets
# Copyright (C) 2011-2015 Michael Hahsler, Christian Buchta, 
#			Bettina Gruen and Kurt Hornik
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.



##*******************************************************
## return the supporting transactions as a tidLists
##


setMethod("supportingTransactions",  signature(x = "associations"),
	function(x, transactions) {
	    ss <- is.subset(x, transactions, sparse=TRUE)
	    new("tidLists", data = t(ss),
		    itemInfo = data.frame(labels = labels(x)),
		    transactionInfo = transactionInfo(transactions))
	})