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Inserting Blank Lists

• To: mathgroup at smc.vnet.net
• Subject: [mg68231] Inserting Blank Lists
• From: Bruce Colletti <vze269bv at verizon.net>
• Date: Sun, 30 Jul 2006 04:47:54 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Re Mathematica 5.2.

The code below inserts a null list between L-elements:

L={{"a","b"},{"c","d"},{"e","f"}};
Most@Flatten[Map[{#,{}}&,L],1]

Out[9]=
{{a,b},{},{c,d},{},{e,f}}

What is a shorter way to do this?  Thankx.

Bruce

• Follow-Ups:
  • Re: Inserting Blank Lists
    • From: Adriano Pascoletti <pascolet@dimi.uniud.it>