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