Re: match 1, replace 2
- To: mathgroup at smc.vnet.net
- Subject: [mg56271] Re: match 1, replace 2
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Wed, 20 Apr 2005 05:32:41 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 4/19/05 at 4:54 AM, trevorbaca at gmail.com (Trevor Baca) 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]?
One way to get this result would be
Flatten@{Transpose@
{100 + Most@#1, Table[-1, {Length@#1 - 1}]},
Last@#1}&/@ ls
{{101, -1, 102, -1, 3}, {104, -1, 5}, {106, -1,
107, -1, 108, -1, 9}}
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