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MathGroup Archive 1999

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Re: Short Doesn't Work

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19273] Re: [mg19253] Short Doesn't Work
  • From: "David Park" <djmp at earthlink.net>
  • Date: Thu, 12 Aug 1999 01:24:26 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

>I am having problems with the Short[] function.
>
>In v3, the following,
>
>randDir:=2 Random[Integer]-1;
>randWalk[n_]:=NestList[#+randDir&,0,n-1];
>(walk=randWalk[1000]  ) // Short
>
>returns
>
><<1>>
>
>I was expecting more than this.  It still doesn't work if I
>use Short[expr,5].
>
>What's going on?
>
>Lawrence
>
>--
>
>
>------------------------------------------------------------
>     (\___/)     The fear of the LORD is the beginning of
>     (o\ /o)     wisdom: a good understanding have all they
>    /|:.V.:|\    that do his commandments: his praise
>    \\::::://    endureth for ever.              Psa 111:10
>-----`"" ""`------------------------------------------------
>        Lawrence A. Walker Jr., M.Eng./Ph.D. Candidate
>                   Morgan State University
>          Clarence M. Mitchell School of Engineering
> COMSARE (Center Of Microwave/Satellite And RF Engineering)
>           Rm: 306-Schafer     Phone: (443)885-1453
>------------------------------------------------------------
>
>
Lawrence,

You can use Shallow. But still I agree with you. Short does not seem to work
properly.

randDir := 2 Random[Integer] - 1;
randWalk[n_] := NestList[# + randDir &, 0, n - 1];
walk = randWalk[1000];

walk // Short
<<1>>

walk // Shallow
{0, 1, 2, 3, 4, 5, 4, 5, 4, 5, <<990>>}

Short seems to be very unpredictable in how it works. Wolfram should either give a
better explanation or fix it or add extra parameters to control its use or get rid of
it.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/



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