position lists
- To: mathgroup at smc.vnet.net
- Subject: [mg68688] position lists
- From: "rych" <rychphd at gmail.com>
- Date: Wed, 16 Aug 2006 03:36:19 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
have
In: a = {1, 1, 2, 2, 1, 4}
want
{{1, 2, 5}, {3, 4}, {0}, {6}};
more effectively than just
In: Position[a, #] & /@ Range[4]
Out: {{{1}, {2}, {5}}, {{3}, {4}}, {}, {{6}}}
Ideas? Known one-liners?
Thanks
Igor
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