Re: Help! Delete Casses based on column
- To: mathgroup at smc.vnet.net
- Subject: [mg58302] Re: [mg58296] Help! Delete Casses based on column
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Sun, 26 Jun 2005 23:13:05 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
data=Table[Random[],{5},{3}]
col=2; threshold=0.3;
DeleteCases[data, _?(#[[col]]<threshold&)]
or
Cases[data, _?(#[[col]]>=threshold&)]
or
Select[data, #[[col]]>=threshold&]
Bob Hanlon
>
> From: tornado78 <tornado78 at hotmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/06/26 Sun AM 01:33:58 EDT
> Subject: [mg58302] [mg58296] Help! Delete Casses based on column
>
> Any help would be apreciated
>
> I need to take a large numeric matrix and remove all the rows that have a
value less than X in column N
>
> Since its a large matrix im looking for an efficient algorithm.
>
> thanks
>
>