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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 signature 'itemMatrix'
image(x, 
    xlab = "Items (Columns)",
    ylab = "Elements (Rows)", ...)

## S4 method for signature 'transactions'
image(x, 
    xlab = "Items (Columns)", 
    ylab = "Transactions (Rows)", ...)

## S4 method for signature '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.

Author(s)

Michael Hahsler

Examples

data("Epub")

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

arules

Mining Association Rules and Frequent Itemsets

v1.6-7

GPL-3

Authors

Michael Hahsler [aut, cre, cph], Christian Buchta [aut, cph], Bettina Gruen [aut, cph], Kurt Hornik [aut, cph], Ian Johnson [ctb, cph], Christian Borgelt [ctb, cph]

Initial release

2021-03-12