image {arules} | R Documentation |
Provides the S4 methods image
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 signature 'itemMatrix': image(x, xlab = "Items (Columns)", ylab = "Elements (Rows)", ...) ## S4 method for signature 'transactions': image(x, ...) ## S4 method for signature 'tidLists': image(x, xlab="Transactions (Columns)", ylab="Items/itemsets (Rows)", ...)
x |
the object (itemMatrix , transactions or
tidLists ). |
xlab, ylab |
labels for the plot. |
... |
further arguments passed on to image in
package Matrix which in turn are passed on to
levelplot in lattice. |
image
(for dgTMatrix
in Matrix),
levelplot
(in lattice),
itemMatrix-class
,
transactions-class
,
tidLists-class
data("Epub") ## in this data set we can see that not all ## items were available from the beginning. image(Epub[1:1000])