Re: a[[0]] equivalent to a[[-1]] and so forth

*To*: mathgroup at smc.vnet.net*Subject*: [mg65148] Re: a[[0]] equivalent to a[[-1]] and so forth*From*: dh <dh at metrohm.ch>*Date*: Wed, 15 Mar 2006 23:59:23 -0500 (EST)*References*: <dv8v5k$n91$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi Alexandra, Mod with offset will do what you want: a[[ Mod[index,3,1] ]] Daniel Alexandre Costa wrote: > Dear Group, > I have a simple issue: > If I have a list such as : > a = {4, 5, 6}; > How can I do this in an elegant way: > a[[0]] equivalent to a[[-1]] > a[[-1]] equivalent to a[[-2]] > and so forth. > > I thought of a[[If[i <=0, i - 1, i]]] would solve the problem > but I want a more elegant way of doing this. > > Any help is very welcome, > Thanks, > Alex > >