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#### Generating Random Automatons

Use the following command to generate a random deterministic finite automaton:

```\$ ./test -o out_file -i random_seed [ -C VAL ] num_in_sig num_out_sig num_states
```

This command creates a file out_file containing the description of a deterministic finite automaton produced using seed random_seed. The automaton has specified numbers of input signals, output signals, and states. If a random seed not specified, the program uses a standard fixed random seed. The first output signal has spur increment 1, and all other output signals have spur increment 0.

If the program receives the option -C VAL, and VAL is not 0, the automaton has its state graph connected. If VAL is positive, the automaton has not more than VAL cycles in the graph. In this case, the program finds the best cycle in the graph. Continuous repeating the best cycle supplies the maximum amount of spur to the system. If VAL is relatively small, the program may not generate the automaton at one push. If an attempt to generate the automaton fails, the program prints a warning message and makes another attempt. If VAL is relatively large, an attempt to generate the automaton may take a long time, so the impression can be that the program has hung.

The special option argument VAL=‘c’ makes the program provide state graph connectivity and find the best cycle in the graph using an algorithm analogous to Viterbi one. The special option argument VAL=‘cs’ makes the program provide state graph connectivity, simplify the state graph by a method also used when VAL is positive, and find the best cycle in the graph by an algorithm analogous to Viterbi one.

The program writes a random seed value to comment lines before the first empty line in out_file. If the option -C VAL has a non-zero VAL, the program also writes to those comment lines information on the best cycle in the state graph:

• – best cycle length as the number of cycle steps;
• – an increment in spur the system receives on repeating the best cycle;
• – average spur increment per step of the best cycle;
• – a list of steps of the best cycle; a description of each step contains a step index stp, an automaton state index stt, an input signal inp received when the automaton was in this state, an output signal out emitted, and a spur increment spr corresponding to the output signal.

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