# size-methods

##### Compute the Size of Sequences

`size`

computes the size of a sequence. This can be either the number
of (distinct) itemsets (elements) or items occurring in a sequence.

`ritems`

compute the minimum (maximum) number an item or itemset
(element) is repeatedly occurring in a sequence.

- Keywords
- methods

##### Usage

```
# S4 method for sequences
size(x, type = c("size", "itemsets", "length", "items"))
```# S4 method for sequences
ritems(x, type = c("min", "max"), itemsets = FALSE)

##### Arguments

- x
- an object.
- type, itemsets
- as string (logical) value specifying the type of count to be computed.

##### Value

Returns a vector of counts corresponding with the *elements*
of object `x`

.

##### Note

The total number of items occurring in a sequence is often referred
to as the *length* of the sequence. Similarly, we refer to the
total number of itemsets as the `size`

of the sequence. Note
that we follow this terminology in the summary methods.

For use with a collection of rules use the accessors `lhs`

or `rhs`

, or coerce to sequences.

##### See Also

##### Examples

```
## continue example
example(cspade)
## default size
size(s2)
size(s2, "itemsets")
size(s2, "length")
size(s2, "items")
## crosstab
table(length = size(s1, "length"),
items = size(s1, "items"))
## repetitions
ritems(s1)
ritems(s1, "max")
ritems(s1, "max", TRUE)
```

*Documentation reproduced from package arulesSequences, version 0.2-19, License: GPL-2*