Subject:
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Re: New Lego challenge !
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 13 Sep 1999 20:20:51 GMT
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Viewed:
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699 times
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In lugnet.robotics, Wes Matchett writes:
>
> Laurentino Martins wrote:
> >
> > At 03:35 13-09-1999 Monday , Mike Poindexter wrote:
> > > Got it figured out. Using the principles of right handed recursion, you • can
> > > have the robot follow the right wall and it will eventually get to the • light
> > > and also get out of the maze again.
> > >
> > > Incidentally, right handed recursion will get you out of any labyrinth
> > > provided that you are not starting inside it already. If you are already • in
> > > it, it will likely work there as well. This would then allow the robot to
> > > work in almost any maze you create.
> >
> > Yes, unfortunately the current firmware implementation from LEGO doesn't
> > have a call stack, so you can not build recursive routines. :-(
> >
> > On the other hand I can imagine labyrinths where that bot would never be • able to do anything out of them.
>
> A call stack is not an absolute requirement to do recursive processing, it
> just
> makes it easier. I have written recursive processes with only an array.
>
> -Wes
Unfortunately, the default RCX firmware doesn't support arrays, either.
Also, the assertion that you can simply follow a wall in order to traverse an
entire labyrinth actually depends on the maze conforming to a certain
topology. I'm sure there's probably some technical/mathematical term for it,
but basically, you are assuming that there are no open loops through the
maze. It is actually very easy to design a maze which will foil a simple wall-
following algorithm.
I don't see any mention of the maze topology in the contest rules. Perhaps
this would be worthy of clarification?
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Message has 1 Reply:
 | | RE: New Lego challenge !
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| This is a REALLY good idea. Here's something I had kicking around in my head... 1. Making a maze that we can all use is kinda hard. 2. Making a bot small enough to fit a standard buildable maze is really hard. I propose we invert the problem a (...) (25 years ago, 13-Sep-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: New Lego challenge !
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| (...) A call stack is not an absolute requirement to do recursive processing, it just makes it easier. I have written recursive processes with only an array. -Wes (25 years ago, 13-Sep-99, to lugnet.robotics)
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