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MathGroup Archive 2007

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Re: List manipulation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73283] Re: List manipulation
  • From: "Norbert Marxer" <marxer at mec.li>
  • Date: Fri, 9 Feb 2007 02:29:23 -0500 (EST)
  • References: <eqep4g$5dk$1@smc.vnet.net>

On 8 Feb., 10:05, "sepp" <gary.lar... at gmx.at> wrote:
> hello,
> I would like to combine list elements in the following way:
>
> I have a list with
> liste={{a1,a2,a3},{b1,b2,b3},{c1,c2,c3},.....}
> and a single element {e}
>
> I would to add the element {e} to each sublist to get something like
> liste_new={ {a1,a2,a3,e},{b1,b2,b3,e},{c1,c2,c3,e},.....}
> so that finally I can apply a function f on the list
> liste_manipulated={f[ {a1,a2,a3,e}],f[{b1,b2,b3,e}],f[{c1,c2,c3,e}],.....}
>
> I had a look at thread, mapthread, inner, outer, but nothing really
> seems to fit...
> thank you in advance for useful comments!

Hi Sepp

You have to apply Map twice. You can either use Append and the element
e or Join and the list {e}:

liste={{a1,a2,a3},{b1,b2,b3},{c1,c2,c3}};

f /@ (Append[#1, e]&) /@ liste

f /@ (Join[#1, {e}] &) /@ liste

Best Regards
Norbert Marxer
www.mec.li





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