Visual Inspection of Binary Incidence Matrices
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, xlab = "Items (Columns)", ylab = "Transactions (Rows)", ...) ## S4 method for signature 'tidLists' image(x, xlab="Transactions (Columns)", ylab="Items/itemsets (Rows)", ...)
x |
the object ( |
xlab, ylab |
labels for the plot. |
... |
further arguments passed on to |
Michael Hahsler
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])
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