Re: Selecting table rows
- To: mathgroup at smc.vnet.net
- Subject: [mg66051] Re: [mg66037] Selecting table rows
- From: Arturas Acus <acus at itpa.lt>
- Date: Fri, 28 Apr 2006 06:32:24 -0400 (EDT)
- References: <200604270626.CAA29283@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On Kt, 2006-04-27 at 02:26 -0400, Skirmantas wrote:
> I have a 2D-table whose first column contains the unique identifiers (ID) of each row (IDs can be any numbers). I need to delete all rows whose IDs are not members of another, control list.
>
> The following works, but I'm wondering if there is a shorter way to do this.
>
> TBL = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}, {17, 18, 19, 20}};
>
> CNTR = {1, 9, 17};
>
> Map[Part[TBL, #]&, Flatten[Map[Position[Transpose[TBL][[1]], #]&, CNTR]]]
>
> Thanks --
>
> Skirmantas
The following short code based on Select pick up requested control
lists
Select[TBL, MemberQ[CNTR, #[[1]]] &]
--
Arturas Acus <acus at itpa.lt>
- References:
- Selecting table rows
- From: Skirmantas <skirmantas.janusonis@yale.edu>
- Selecting table rows