Re: position lists
- To: mathgroup at smc.vnet.net
- Subject: [mg68718] Re: [mg68688] position lists
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Thu, 17 Aug 2006 04:18:26 -0400 (EDT)
- References: <200608160736.DAA06180@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On Aug 16, 2006, at 3:36 AM, rych wrote:
> 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?
Flatten[Position[a,#]]&/@Range[4]/.{}->{0}
Regards,
Ssezi
- References:
- position lists
- From: "rych" <rychphd@gmail.com>
- position lists