Re: LOGO-L> Recursion

["Olga Tuzova" <olgatu@ort.spb.ru>]

> Date:          Thu, 19 Mar 1998 07:53:21 -0600
> To:            "Olga Tuzova" <olgatu@ort.spb.ru>
> From:          Jim Muller <jmul@cyberramp.net>
> Subject:       Re: LOGO-L> Recursion

> Olga ==>
> 
> You take the fun away (:>)
> 
> I have found it interesting -- and fun -- to watch the thought processes
> people of all ages go through to determine the difference between the two
> procedures. 

How have you managed to do this - watching thought processes?

I'm very sorry for taking the fun away, but I hope very much, those 
who wanted to get it, have got. I've made a rather long pause.

But, if you insist, I'll never do such things in future.

:-)
Regards,
Olga.

>Of course, you have added another challenge. How did Olga make
> such a great demonstration?
> 
> Regards...Jim
> 
> At 03:35 PM 3/19/98 +300, you wrote:
> >> Date:          Wed, 18 Mar 1998 23:22:47 +1000
> >> From:          Bill Mackay <wmackay@scu.edu.au>
> >> To:            logo-l@gsn.org
> >> Subject:       LOGO-L> Recursion
> >> Reply-to:      Bill Mackay <wmackay@scu.edu.au>
> >
> >> Hello,
> >> I've just joined the list so maybe this has been covered - but I didn't
> >> see it in the archives.  Can someone explain when we would use tail
> >> recursion or embedded recursion? Perhaps an example may suffice.
> >> Thanks in advance,
> >> Bill Mackay
> >
> >Bill,
> >
> >I've never met here html-files with pictures being sent as an 
> >attachment, so I'm not sure it will work well. Nevertheless I'm 
> >trying.
> >
> >The attachment contains html-file and two animated pictures of 
> >spirals to demonstrate the difference between tail and embedded 
> >recursion.
> >
> >These pictures are just illustrating Jim Muller's MAZE and AMAZE.
> >You'll see, the behaviour of SPIRAL1 (spiral1a.gif) differs from one 
> >of SPIRAL2 (spiral2a.gif) and the behaviour of SPIRAL2 coinsides  
> >with the one of SPIRAL3.
> >
> >TO SPIRAL1 :A
> >   IF :A<10 [STOP] 
> >   FD :A  RT 90
> >   SPIRAL1 :A-10
> >END
> >
> >TO SPIRAL2 :A
> >   IF :A<10 [STOP] 
> >   SPIRAL2 :A-10
> >   FD :A  RT 90
> >END
> >
> >TO SPIRAL3 :A
> >   IF :A>100 [STOP] 
> >   FD :A  RT 90
> >   SPIRAL3 :A+10
> >END
> >
> >All the best,
> >Olga.
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