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MathGroup Archive 2004

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Re: Iterator problem.

  • To: mathgroup at
  • Subject: [mg52335] Re: [mg52327] Iterator problem.
  • From: DrBob <drbob at>
  • Date: Wed, 24 Nov 2004 02:32:06 -0500 (EST)
  • References: <>
  • Reply-to: drbob at
  • Sender: owner-wri-mathgroup at

The Table statement as you've written it (ignoring the syntax problem) suggests that you want i <= j <= k. If so, the table can be written in a couple of ways, equivalent except for order:


{3 a[1],2 a[1]+a[2],2 a[1]+a[3],a[1]+2 a[2],a[1]+a[2]+a[3],a[1]+2 a[3],3
     a[2],2 a[2]+a[3],a[2]+2 a[3],3 a[3]}

{3 a[1],2 a[1]+a[2],a[1]+2 a[2],3 a[2],2 a[1]+a[3],a[1]+a[2]+a[3],2 a[2]+a[3],
   a[1]+2 a[3],a[2]+2 a[3],3 a[3]}


If you wanted i < j < k, the table is either of these:





(That's a hard way to do it, of course.)


On Tue, 23 Nov 2004 02:12:46 -0500 (EST), Robert G. Wilson v <rgwv at> wrote:

> Hello,
> 	I am having a problem with iterators in Mathematica.
> 	I have a sequence of integers defined by a[n]. I wish to build a table
> of integers out of the above such that this table only contains integers of
> the form a(i)+a(j)+a(k).
> 	I tried Table[a[i] + a[j] + a[k], {k, 1, 3}, {j, i, k}, {i, 1, j}] but
> the iterators do not have appropriate bounds.
> 	Any help would be greatly appreciated.
> Sincerely,
> Bob.

DrBob at

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