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2010

On the Average Number of States of Partial Derivative Automata

11 years 9 months ago
On the Average Number of States of Partial Derivative Automata
The partial derivative automaton (Apd) is usually smaller than other non-deterministic finite automata constructed from a regular expression, and it can be seen as a quotient of the Glushkov automaton (Apos). By estimating the number of regular expressions that have as a partial derivative, we compute a lower bound of the average number of mergings of states in Apos and describe its asymptotic behaviour. This depends on the alphabet size, k, and its limit, as k goes to infinity, is 1 2 . The lower bound corresponds exactly to consider the Apd automaton for the marked version of the regular expression, i.e. where all its letters are made different. Experimental results suggest that the average number of states of this automaton, and of the Apd automaton for the unmarked regular expression, are very close to each other.
Sabine Broda, António Machiavelo, Nelma Mor
Added 29 Oct 2010
Updated 29 Oct 2010
Type Conference
Year 2010
Where DLT
Authors Sabine Broda, António Machiavelo, Nelma Moreira, Rogério Reis
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