Re: Partitioning lists
- To: mathgroup at smc.vnet.net
- Subject: [mg20487] Re: Partitioning lists
- From: "Seth Chandler" <SChandler at uh.edu>
- Date: Wed, 27 Oct 1999 02:04:51 -0400
- Organization: University of Houston
- References: <7v3dfq$63d@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
I am not sure this is any better, but the following also works
Union[DeleteCases[
ReplaceList[{a, b, c, d, e, f}, {x___, y___} -> {{x}, {y}}], {},
Infinity]]
DIAMOND Mark <noname at noname.com> wrote in message
news:7v3dfq$63d at smc.vnet.net...
> I would like a function f to split a list as follows
>
> a={1,2,3,4,5,6}
> f[a] =
> {
> {{1},{2,3,4,5,6}},
> {{1,2},{3,4,5,6}},
> {{1,2,3},{4,5,6}},
> {{1,2,3,4},{5,6}},
> {{1,2,3,4,5},{6}}
> }
>
> I can do this as
>
> Table[{Take[a, i], Drop[a, i]}, {i, 1, Length[a] - 1}]
>
> but it *looks* as though it is very inefficient. Is it?
> It also looks as though there should be a way of using Partition simply to
> chop a list between positions i and i+1, but
> I cannot see how to do it. Any suggestions?
>
>
> mark diamond
> no spam email: markd at psy dot uwa dot edu dot au
>
>
>
>
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