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Re: Filtering a list of list for certain elements that are neighbours

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88862] Re: Filtering a list of list for certain elements that are neighbours
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Mon, 19 May 2008 06:45:20 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <g0p4a2$nc4$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

Cases[mylist, {a, ___, b} | {b, ___, a}]

if this is equivalent to "a being a neighbor to b"
what ever this mean.

Regards
   Jens

Steven Siew wrote:
> I have a list of lists
> 
> mylist={{a,b,c},{a,c,b},{b,a,c},{b,c,a},{c,a,b},{c,b,a}}
> 
> I want to filter out all lists that have "a being a neighbor to b".
> 
> I am looking for the following result.
> 
> {{a,c,b},{b,c,a}}
> 
> 
> For this toy example, I can probably do it by hand but my real problem
> has 120 lists in a list. And I need to filter out various combination
> of letters like "s cannot be next to d" , "s cannot be next to j" , "c
> cannot be next to j" , "h cannot be next to d" and "h cannot be next
> to s".
> 


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