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MathGroup Archive 1999

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Re: Help: Outer of a list of lists

  • To: mathgroup at
  • Subject: [mg19631] Re: Help: Outer of a list of lists
  • From: Paul Abbott <paul at>
  • Date: Mon, 6 Sep 1999 04:20:45 -0400
  • Organization: University of Western Australia
  • References: <7qrrui$4r6$>
  • Sender: owner-wri-mathgroup at

Joako wrote:

> In[1]:=
> (* I've got a list of lists as A *)
> A={{a,b},{c,d},{e,f}}
> Out[1]=
> {{a,b},{c,d},{e,f}}
> In[2]:=
> (* Where the number of sublists is N and the lengh of every sublist is L,
>   and I want to obtain the Outer list of the sublists, obviously I can
> do: *)
> Outer[List,{a,b},{c,d},{e,f}]
> Out[2]=
> {{{{a,c,e},{a,c,f}},{{a,d,e},{a,d,f}}},{{{b,c,e},{b,c,f}},{{b,d,e},{b,d,f}}}}
> (* but N and L can take different values,
>   so I need to obtain Outer List directly from A,

Outer[List, Sequence @@ A]

Paul Abbott                                   Phone: +61-8-9380-2734
Department of Physics                           Fax: +61-8-9380-1014
The University of Western Australia
Nedlands WA  6907                     mailto:paul at

            God IS a weakly left-handed dice player

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