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 > >