arules (version 1.7-2)

image: Visual Inspection of Binary Incidence Matrices

Description

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).

Usage

# 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)", ...)

Arguments

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.

See Also

image (for dgTMatrix in Matrix), levelplot (in lattice), itemMatrix-class, transactions-class, tidLists-class

Examples

# NOT RUN {
data("Epub")

## in this data set we can see that not all
## items were available from the beginning.
image(Epub[1:1000])

# }