Nothing

```
#######################################################################
# 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.
### itemUnion
setMethod("itemUnion", signature(x = "itemMatrix", y = "itemMatrix"),
function(x, y) {
if(length(x)!=length(y)) stop("Length mismatch between x and y!")
### the C code does not deal well with a large number of dense rules.
#[email protected] <- .Call(R_or_ngCMatrix", [email protected], [email protected])
x@data <- as(x@data+y@data, "ngCMatrix")
x
}
)
setMethod("itemSetdiff", signature(x = "itemMatrix", y = "itemMatrix"),
function(x, y) {
if(length(x)!=length(y)) stop("Length mismatch between x and y!")
x@data <- as(drop0(as(x@data-y@data >0, "dgCMatrix")), "ngCMatrix")
x
}
)
setMethod("itemIntersect", signature(x = "itemMatrix", y = "itemMatrix"),
function(x, y) {
if(length(x)!=length(y)) stop("Length mismatch between x and y!")
x@data <- as(drop0(x@data*y@data), "ngCMatrix")
x
}
)
```

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