| 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])