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MathGroup Archive 2005

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Re: problem with Delete[]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59007] Re: [mg58917] problem with Delete[]
  • From: "Tomas Garza" <tgarza10 at msn.com>
  • Date: Tue, 26 Jul 2005 04:03:29 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Delete[v, j] produces a new list containing those elements of v which are 
not j. It doesn't actually modify v.

Tomas Garza
Mexico City

>From: Heath Gerhardt <heathgerhardt at hotmail.com>
To: mathgroup at smc.vnet.net
>Subject: [mg59007] [mg58917]  problem with Delete[]
>Date: Sat, 23 Jul 2005 05:32:47 -0400 (EDT)
>
>Hello,
>
>Delete[] is not removing elements of v in the following function, could
>anyone tell me why?
>
>Rn[N_, p_] := Module[{A, v, c, q, i, j},
>      A = Table[0, {i, 1, N}, {j, 1, N}];
>      v = Table[i, {i, 2, N}];
>      c = 1;
>      For[i = 1, i < N, i++,
>        j = Random[Integer, {1, Dimensions[v][[1]]}];
>        A[[c, v[[j]]]] = 1;
>        A[[v[[j]], c]] = 1;
>        q = Random[];
>        If[q > p, c = v[[j]]];
>        Delete[v, j];
>        ];
>      A
>      ]
>
>thanks in advance,
>Heath
>



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