DFA graphical representation not reflecting the JSON file

[aymeric75]

Hello,

Running this code:

`from PySimpleAutomata import DFA, automata_IO

dfa_example = automata_IO.dfa_json_importer("examplee.json")

DFA.dfa_completion(dfa_example) new_dfa=DFA.dfa_minimization(dfa_example)

automata_IO.dfa_to_dot(new_dfa, 'outputttt-name', './')`

Where examplee.json is

{ "alphabet": [ "5c", "10c", "gum" ], "states": [ "s0", "s1", "s2", "s3", "s4" ], "initial_state": "s0", "accepting_states": [ "s0", "s2" ], "transitions": [ ["s0","5c","s1"], ["s0","10c","s4"], ["s1","5c","s2"], ["s1","10c","s3"], ["s2","5c","s3"], ["s2","10c","s3"], ["s4","5c","s3"], ["s4","10c","s3"], ["s3","gum","s0"] ] }

I get:

It seems not in accordance with the JSON file... for instance why is there a "SINK" node ?

Thanks

[Oneiroe]

Hi aymeric75,

The output is correct because you used the dfa_completion function, which completes the automaton. To put it in simple terms, completing an automaton guarantees that every state has a transition defined for each element of the alphabet. The "sink" state is added to capture all the missing transitions in the original automaton.

I hope you'll find this helpful.

[aymeric75]

Thanks, after having looked at the doc I cannot find a function where I could display only the nodes and transitions specified...

[Oneiroe]

The function dfa_to_dot does exactly that. Mind the input: in your example, you have to remove the completion (as already discussed) and the minimization (because it entails the completion) to output the image of the input automaton without alterations.

[aymeric75]

Thanks I am going to try today and close the issue if it works

[aymeric75]

Hello,

My code is now:

from PySimpleAutomata import DFA, automata_IO

dfa_example = automata_IO.dfa_json_importer("DFA_Hanoi_4_4.json")

new_dfa=DFA.dfa_reachable(dfa_example)

automata_IO.dfa_to_dot(new_dfa, 'DFA-Hanoi-4-4', './')

And the DFA_Hanoi_4_4.json is attached, DFA_Hanoi_4_4.json

But when I run this code I get:

graphviz.backend.execute.CalledProcessError: Command '[PosixPath('dot'), '-Kdot', '-Tsvg', '-O', 'DFA-Hanoi-4-4.dot']' returned non-zero exit status 1. [stderr: b"Error: DFA-Hanoi-4-4.dot: syntax error in line 259 near '['\n"]

[EDIT] the code also generates a .dot files (attached as a txt file DFA-Hanoi-4-4.txt ) which seems corrupted (look near l. 259 after the "fake" statement, the quotes disappear)