Re: Iterator problem.
- To: mathgroup at smc.vnet.net
- Subject: [mg52336] Re: Iterator problem.
- From: David Bailey <dave at Remove_Thisdbailey.co.uk>
- Date: Wed, 24 Nov 2004 02:32:07 -0500 (EST)
- References: <cnuoj6$squ$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Robert G. Wilson v 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.
>
Your middle iterator depends on i, which is your innermost iterator -
hence the error. Try
Table[a[i] + a[j] + a[k], {k, 1, 3}, {j, i, k}, {i, 1, j}] //Flatten
David Bailey