MathGroup Archive 2004

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Building List

  • To: mathgroup at
  • Subject: [mg48015] Building List
  • From: "Bruce W. Colletti" <bcolletti at>
  • Date: Fri, 7 May 2004 04:29:35 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Re Mathematica

I have a list of lists -- e.g., L = { {1,2},{3,4,5,6},{7,8} } -- and 
want to replace element-lists (whose length exceeds 2) with another list 
built from that element.  All else is untouched.

For instance, using L above, replace {3,4,5,6} with {3,4}, {3,5}, {3,6}. 
 This transforms L to the desired form { {1,2}, {3,4}, {3,5}, {3,6}, 
{7,8} }.

Although I can do this using Sow and Reap, am hoping there's an easier 
way using rules (/.).  In general, I want to replace those L-elements x 
(that meet a criterion) with foo[x]. 



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