match {arules} | R Documentation |
Provides the generic function match
and the S4 methods for
associations and transactions. match
returns a vector of the
positions of (first) matches of its first argument in its second.
%in%
is a more intuitive interface as a binary operator, which
returns a logical vector indicating if there is a match or not for
its left operand.
match(x, table, nomatch = NA_integer_, incomparables = NULL) x %in% table
x |
an object of class |
table |
a set of associations or transactions to be matched against. |
nomatch |
the value to be returned in the case when no match is found. |
incomparables |
not implemented. |
match
: An integer vector of the same length as x
giving the
position in table
of the first match if there is a match, otherwise
nomatch
.
%in%
: A logical vector, indicating if a match was located for each
element of x
.
rules-class
,
itemsets-class
,
itemMatrix-class
data("Adult") ## get unique transactions, count frequency of unique transactions ## and plot frequency of unique transactions vals <- unique(Adult) cnts <- tabulate(match(Adult, vals)) plot(sort(cnts, decreasing=TRUE)) ## find all transactions which are equal to transaction 10 in Adult which(Adult %in% Adult[10])