1.5 Notation

Notation of itemset

The execution results in Ruby present the itemset which contains items and weight separated by space. Itemsets are displayed as character strings within text or comments, spaces between items are removed for simplicity. For example, itemset {a,b,c} with weight of 3 is displayed as "3 a b c" in the results. However, it will be displayed as "3abc" in text or comment.

Example

Multiple examples are included in this manual. The meaning of symbols used in the examples are as follows.

• > : Display Ruby input method.

• $ : Display shell command line input.

• # : Display comments.

• No symbol : Display the execution results.

The example contains the execution results log from the basic Ruby command line tool irb.