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MathGroup Archive 2005

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Re: Tilting at Windmills?

  • To: mathgroup at
  • Subject: [mg62130] Re: Tilting at Windmills?
  • From: lucb at
  • Date: Sat, 12 Nov 2005 03:31:43 -0500 (EST)
  • Sender: owner-wri-mathgroup at

Matt, would this do what you want in a simpler way?

test = Range[5]

the list is first duplicated to have 4 lists using Table. Then the elements are re-arranged using Transpose and flatten.
Then we remove the first 3 and the last 3 and finally Partition it like you wnat.

Partition[Drop[Drop[Flatten[Transpose[Table[test, {4}]]], 3], -3], 2]

on this server it seems to go fast

Timing[result = Partition[Drop[Drop[Flatten[Transpose[Table[ Range[200000], {4}]]], 3], -3], 2];]

I hope this helps,


P.S: and Phil was faster than me at answering this...

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