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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.

• Follow-Ups:
  • Re: match 1, replace 2
    • From: János <janos.lobb@yale.edu>
  • Re: match 1, replace 2
    • From: "Fred Simons" <f.h.simons@tue.nl>
  • Re: match 1, replace 2
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • Re: match 1, replace 2
    • From: yehuda ben-shimol <bsyehuda@gmail.com>