automaton.is_coaccessible

Whether all its states are coaccessible, i.e., its transposed automaton is accessible, in other words, all its states cab reach a final state.

Preconditions:

Examples



In [1]:

    
import vcsn

State 3 of the following automaton cannot reach a final state.



In [2]:

    
%%automaton a
context = "lal_char(abc), b"
$ -> 0
0 -> 1 a
1 -> $
2 -> 0 a
1 -> 3 a



In [3]:

    
a.is_coaccessible()









    Out[3]:





False

Calling accessible returns a copy of the automaton without non-accessible states:



In [4]:

    
a.coaccessible()









    Out[4]:



In [5]:

    
a.coaccessible().is_coaccessible()









    Out[5]:





True