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MathGroup Archive 2005

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Re: match 1, replace 2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56276] Re: match 1, replace 2
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Wed, 20 Apr 2005 05:32:56 -0400 (EDT)
  • Organization: The University of Western Australia
  • References: <d42khj$3ac$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <d42khj$3ac$1 at smc.vnet.net>,
 "Trevor Baca" <trevorbaca at gmail.com> wrote:

> 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]?

Here is one solution:

  {{1, 2, 3}, {4, 5}, {6, 7, 8, 9}} /.   
    {a__, b_Integer} :> Join[Flatten[({# + 100, -1} & ) /@  {a}], {b}]

Cheers,
Paul

-- 
Paul Abbott                                   Phone: +61 8 6488 2734
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