Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: pattern matching and droping elements from list of lists.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49769] Re: pattern matching and droping elements from list of lists.
  • From: "Michael Taktikos" <michael.taktikos at hanse.net>
  • Date: Fri, 30 Jul 2004 06:02:21 -0400 (EDT)
  • References: <ceargm$av9$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In this case, since the length of the inner sublists is allways 3,

DeleteCases[Outer[List, {a, b, c}, {a, b, c}, {a, b, c}], {x_, x_, x_}, -1]

works.
Generalization, if you produce outer lists with sublists of other lengths:
then you have to give to the allowed sublists an attribute, i.e.

allowQ[sublist_] := Length[Union[sublist]] > 1

and then extract with the function Select the sublists for which allowQ is
True.

Greetings from Hamburg,

Michael Taktikos

  "sean kim" <sean_incali at yahoo.com> schrieb im Newsbeitrag
news:ceargm$av9$1 at smc.vnet.net...
> hello group,
>
> Outer[List, {a, b, c}, {a, b, c}, {a, b, c}]
>
> will output
>
> {{
> {{a, a, a}, {a, a, b}, {a, a, c}}, {{a, b, a}, {a, b, b}, {a, b, c}},
> {{a, c, a}, {a, c, b}, {a, c, c}}},
> {{{b, a, a}, {b, a, b}, {b, a, c}}, {{b, b, a}, {b, b, b}, {b, b, c}},
> {{b, c, a}, {b, c, b}, {b, c, c}}},
> {{{c, a, a}, {c, a, b}, {c, a, c}}, {{c, b, a}, {c, b, b}, {c, b, c}},
> {{c, c, a}, {c, c, b}, {c, c, c}}
> }}
>
> how do I remove {a,a,a} and {b,b,b} and {c,c,c} from above?
>
> thanks all in advance for any insights
>
> sean
>



  • Prev by Date: Re: Problem with loops in Mathematica
  • Next by Date: Question on Compile[]
  • Previous by thread: Re: pattern matching and droping elements from list of lists.
  • Next by thread: Re: pattern matching and droping elements from list of lists.