length: Getting the Number of Elements
Description
S4 methods for length which return the number of elements of
objects defined in the package arules.Usage
## S3 method for class 'rules':
length(x)
## S3 method for class 'itemsets':
length(x)## S3 method for class 'itemMatrix':
length(x)
Value
- An
integer giving the length of x.
Details
For itemMatrix and
transactions the length is defined
as the number of rows (transactions) in the binary incidence matrix.
For sets of associations (rules,
itemsets and
associations in general) the length
is defined as the number of elements in the set (i.e., the number of
rules or itemsets).
For tidList the length is the number of
elements in the object (a transaction ID list belongs to a set of
itemsets and contains for each itemset in the set one list element
containing several transaction IDs).