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MathGroup Archive 2006

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Re: Partition

  • To: mathgroup at
  • Subject: [mg71648] Re: Partition
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at>
  • Date: Sun, 26 Nov 2006 03:48:31 -0500 (EST)
  • Organization: The Open University, Milton Keynes, UK
  • References: <ek975q$fjq$>

KFUPM wrote:
> Dear All
> I have a very large list of numbers that look like this: ( although the
> size is different)
> list={a,b,c,d,e,f,g,h,i,j,k,l,m,n,o}
> And i need to rewrite the list into
> list2={a,{b,c,d,e},f,{g,h,i,j,},k,{l,m,n,o}}
> Since my list is too big, i need Mathematica to do it for me regardless
> of the site of the list.
> I would appreciate it if you can help me in this regard,
> Thanks
You could try

list = {a, b, c, d, e, f, g, h, i, j, k, l, m, n, o};

Flatten[Partition[list, 5] /. {(x_)?AtomQ, y__} -> {x, {y}}, 1]

{a, {b, c, d, e}, f, {g, h, i, j}, k, {l, m, n, o}}


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