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MathGroup Archive 2006

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65120] a[[0]] equivalent to a[[-1]] and so forth
  • From: "Alexandre Costa" <amscosta at uem.br>
  • Date: Wed, 15 Mar 2006 06:28:37 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

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



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