> Subject: /Re: [Jprogramming] What a drag
>
> > This scan pattern seems so simple in explicit code,
> > that it's surprizing that in J to run it
> > efficiently it requires quite a trick:
> >
> > ([^:(0=]))~ /\.&.|. 3 0 0 2 0 4
> > 3 3 3 2 2 4
> >
>
> I've been looking for something like this, only I think I conceived it in
> another context:
>
> An adverb I call trace, that shows a series of states, given a finite
> state
> machine, an initial state, and a series of transitions:
>
> fsm trace S_init,transitions
>
> My initial solution was
>
> fsm/\init,transitions
>
> but I can see how
>
> fsm~/\. &. |.
>
> would work as well.
>
> Therefore:
>
> trace =: 1 : 'u~/\.&.|.'
Tacitly,
trace=. ((~/)\.)(&.|.)
>
> works for me.
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