automaton.coaccessible

Create a new automaton from the coaccessible part of the input, i.e., the subautomaton whose states can be reach a final state.

Preconditions:

Postconditions:

Examples



In [1]:

    
import vcsn

The following automaton has states that cannot be reach any final(s) states:



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 coaccessible returns the same automaton, but without its non-coaccessible states:



In [4]:

    
a.coaccessible()









    Out[4]:



In [5]:

    
a.coaccessible().is_coaccessible()









    Out[5]:





True