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MathGroup Archive 2005

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match 1, replace 2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56199] match 1, replace 2
  • From: "Trevor Baca" <trevorbaca at gmail.com>
  • Date: Tue, 19 Apr 2005 04:54:55 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

hi mathgroup,

what rule takes

ls = {{1, 2, 3}, {4, 5}, {6, 7, 8, 9}}

to

      {{101, -1, 102, -1, 3}, {104, -1, 5}, {106, -1, 107, -1, 108, -1,
9}}

ie, matches all integers but the last in each list and then replaces
each matched integer n with the 2-element sequence Sequence[100 + n,
-1]?

trevor.


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