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#######################################################################
# arulesViz - Visualizing Association Rules and Frequent Itemsets
# Copyrigth (C) 2011 Michael Hahsler and Sudheer Chelluboina
#
# 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.
## FIXME: abbreviate destroys appreviate in base!
## Make abbrevate generic
abbreviate <- function(...) UseMethod("abbreviate")
abbreviate.default <- function(...) base::abbreviate(...)
abbreviate.transactions <- function(data, minlength = 4, ...,
method = "both.sides"){
## both sides helps with labels of form variable=level
itemInfo(data)$labels_orig <- itemInfo(data)$labels
itemInfo(data)$labels<- as.factor(
abbreviate(itemInfo(data)$labels, minlength, ..., method = method)
)
data
}
abbreviate.itemMatrix <- function(data, minlength = 4, ...,
method = "both.sides"){
## both sides helps with labels of form variable=level
itemInfo(data)$labels_orig <- itemInfo(data)$labels
itemInfo(data)$labels<- as.factor(
abbreviate(itemInfo(data)$labels, minlength, ..., method = method)
)
data
}
abbreviate.rules <- function(data, minlength = 4, ...,
method = "both.sides"){
new("rules", lhs = abbreviate(lhs(data), minlength, ..., method),
rhs = abbreviate(rhs(data), minlength, ..., method),
quality = quality(data))
}
abbreviate.itemsets <- function(data, minlength = 4, ...,
method = "both.sides"){
new("itemsets", items = abbreviate(items(data), minlength, ..., method),
quality = quality(data))
}
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