| 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.
match(x, table, nomatch = NA, incomparables = FALSE)
x |
an object of class itemMatrix, transactions or
associations. |
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. |
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.
rules-class,
itemsets-class,
itemMatrix-class
data("Adult")
### get unique transactions
vals <- unique(Adult)
### count frequency of unique transactions
cnts <- tabulate(match(Adult, vals))
### plot frequency of unique transactions
plot(sort(cnts, decreasing=TRUE))