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MathGroup Archive 2005

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Re: problem with Delete[]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58925] Re: [mg58917] problem with Delete[]
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 24 Jul 2005 01:21:47 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Delete doesn't change v

v={a,b,c,d,e};

Delete[v,3]

{a,b,d,e}

v

{a,b,c,d,e}

If you want v to change, use

v=Delete[v,3]

{a,b,d,e}

v

{a,b,d,e}


Bob Hanlon

> 
> From: Heath Gerhardt <heathgerhardt at hotmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/07/23 Sat AM 05:32:47 EDT
> Subject: [mg58925] [mg58917]  problem with Delete[]
> 
> 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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