Re: pattern matching and droping elements from list of lists.
- To: mathgroup at smc.vnet.net
- Subject: [mg49753] Re: [mg49742] pattern matching and droping elements from list of lists.
- From: Oleksandr Pavlyk <pavlyk at phys.psu.edu>
- Date: Fri, 30 Jul 2004 06:02:06 -0400 (EDT)
- Organization: Penn State University; Department of Physics
- References: <200407291146.HAA10396@smc.vnet.net>
- Reply-to: pavlyk at phys.psu.edu
- Sender: owner-wri-mathgroup at wolfram.com
Hi Sean,
The trick is to replace unnecessary entries with
blank sequence
Outer[List, {a, b, c}, {a, b, c}, {a, b, c}]/.
List[a_,a_,a_] -> Sequence[]
Sasha
sean kim wrote:
> 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
>
- References:
- pattern matching and droping elements from list of lists.
- From: sean_incali@yahoo.com (sean kim)
- pattern matching and droping elements from list of lists.