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MathGroup Archive 1997

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Re: list manipulation problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg9083] Re: [mg9062] list manipulation problem
  • From: Allan Hayes <hay at haystack.demon.co.uk>
  • Date: Mon, 13 Oct 1997 23:33:01 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Teemu Vesanen <Teemu.Vesanen at sci.fi>
[mg9062] list manipulation problem

> I have a list like
> {{a, b, c}, {d, e, f}, {g, h, i}}
> I need to delete the third term of each sublist.
> In other words how do I make the list look like
> {{a, b}, {d, e}, {g, h}}

Teemu:

lst = {{a, b, c}, {d, e, f}, {g, h, i}};

Drop[#,-1]&/@lst
	{{a, b}, {d, e}, {g, h}}
or
Transpose[Drop[Transpose[lst],-1]]
	{{a, b}, {d, e}, {g, h}}
	
(using Thread instead of Transpose is often quicker)

Of course the techniques can be used more generally

Drop[#,{2}]&/@lst
	{{a, c}, {d, f}, {g, i}}
	
Allan Hayes
hay at haystack.demon.co.uk
http://www.haystack.demon.co.uk/training.html
voice:+44 (0)116 2714198
fax: +44 (0)116 2718642
Leicester,  UK



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