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MathGroup Archive 2004

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Re: Simple Module Code

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49571] Re: Simple Module Code
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Fri, 23 Jul 2004 06:01:34 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 7/22/04 at 2:45 AM, umdougmm at hotmail.com (Doug) wrote:

>Does anyone know why the following code would not work inside a
>module? list = AppendTo[list, data];

>here's the exact code splitData[data_, list_, i_] := Module[{},
>Print["In Split Data ", i];

>If[data[[i,1]]==1, list = AppendTo[list, data[[i, 2]]]];
>Print["Length of list is: ", Length[list]];
>]

>which is called by: Do[splitData[data, list, i], {i, 1,
>Length[data]}]

>It complains about to many recursions, yet on the command line
>alone, list = AppendTo[list, data]; works just fine?

It appears your goal is to extract column 2 from a data list having at least two columns. If so, you are certainly doing things the hard way. If data is a n x m matrix, then

c = data[[All, 2]] will be vector with the values of column 2, i.e.,

data = Table[Random[], {i, 5}, {j, 5}]; 
c = data[[All,2]]; 
And @@ MapThread[#1 == #2[[2]]&, {c, data}]

True
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