Provides image() methods to generate level plots to visually
inspect binary incidence matrices, i.e., objects based on
itemMatrix (e.g., transactions, tidLists, items in
itemsets or rhs/lhs in rules). These plots can be used to identify problems
in a data set (e.g., recording problems with some transactions containing
all items).
# S4 method for itemMatrix
image(x, xlab = "Items (Columns)", ylab = "Elements (Rows)", ...)# S4 method for transactions
image(x, xlab = "Items (Columns)", ylab = "Transactions (Rows)", ...)
# S4 method for tidLists
image(x, xlab = "Transactions (Columns)", ylab = "Items/itemsets (Rows)", ...)
the object (itemMatrix, transactions or tidLists).
labels for the plot.
further arguments passed on to image() in package
Matrix which in turn are passed on to levelplot() in
lattice.
Michael Hahsler
image() in package Matrix
Other itemMatrix and transactions functions:
abbreviate(),
c(),
crossTable(),
duplicated(),
extract,
hierarchy,
inspect(),
is.superset(),
itemFrequency(),
itemFrequencyPlot(),
itemMatrix-class,
match(),
merge(),
random.transactions(),
sample(),
sets,
size(),
supportingTransactions(),
tidLists-class,
transactions-class,
unique()
data("Epub")
## in this data set we can see that not all
## items were available from the beginning.
image(Epub[1:1000])
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