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MathGroup Archive 2005

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Re: Partitioning a list from an index

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56948] Re: Partitioning a list from an index
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 11 May 2005 05:24:03 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <d5mv78$e05$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

OverhangPartition[lst_, partlen_, over_] :=
Join[Take[lst, over], Partition[Drop[Drop[lst, 
over], -over], partlen],
Take[lst, -over]]

list1 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

In[]:=OverhangPartition[list1, 3, 2]

Out[]={1, 2, {3, 4, 5}, {6, 7, 8}, 9, 10}

In[]:=OverhangPartition[list1, 2, 1]

Out[]={1, {2, 3}, {4, 5}, {6, 7}, {8, 9}, 10}

Regards

  Jens

"Guy Israeli" <guyi1 at netvision.net.il> schrieb im 
Newsbeitrag news:d5mv78$e05$1 at smc.vnet.net...
> hello,
>
> how can partition a list (doesn't have to be 
> with 'Partition') such that the
> partition will begin with a specific index?
>
> like this:
>
> list1={1,2,3,4,5,6,7,8,9,10}
>
> and i might want to split it to pairs or threes 
> from index 6 for example, so
> for threes it will be
>
> {1,2,{3,4,5},{6,7,8},9,10}
>
> with or without padding to those that are left, 
> depends on what it is
> possible, or maybe put them together or 
> something
>
> for pairs it will be 
> {1,{2,3},{4,5},{6,7},{8,9},10}
> again with or without padding
>
> thank you very much
>
> Guy
>
> 



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