# automaton.prefix¶

An automaton that accepts all the prefixes of the words accepted by the previous automaton.

Algorithm:

• Every coaccessible non-final state is made final, with weight one.

Preconditions:

• None

Caveat:

• While semantically sound for Boolean automata, hardly makes sense on weighted automata.

## Examples¶

In [1]:
import vcsn

In [2]:
%%automaton -s a
context = "lan_char, q"
$-> 0 <2> 0 -> 1 <3>a 1 -> 1 <4>b 1 -> 2 <5>\e 2 -> 3 <6>c 3 -> 4 <7>d 3 -> 5 <8>e 4 ->$ <9>
6 -> 0 <10>A

In [3]:
a.prefix()

Out[3]: