Re: simple question about removing elements from a table
- To: mathgroup at smc.vnet.net
- Subject: [mg122424] Re: simple question about removing elements from a table
- From: "Dr. Wolfgang Hintze" <weh at snafu.de>
- Date: Fri, 28 Oct 2011 05:34:38 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <j89umn$2e$1@smc.vnet.net>
Select[data, #1[[1]] <= 0 & ] --- Wolfgang "Michael B. Heaney" <mheaney at gmail.com> schrieb im Newsbeitrag news:j89umn$2e$1 at smc.vnet.net... > Hi, > > I have a data table: > > data={{-0.5, 0.0321787}, {-0.489, 0.0321691}, {-0.478, > 0.032211}, {-0.467, 0.0321723}, {-0.456, 0.0322448}, {-0.444, > 0.0321498}, > {-0.433, 0.032132}, {-0.422, 0.0321804}, {-0.411, 0.0322158}, > {-0.4, 0.0320886}, {-0.233, 0.0320596}, {0.567, 0.00286087}, > {0.578, > -0.00143633}, {0.589, -0.00592979}, {0.6, -0.0113609}} > I want to remove all of the elements that have a positive first > number, to > get: > > datasubset={{-0.5, 0.0321787}, {-0.489, 0.0321691}, {-0.478, > 0.032211}, {-0.467, 0.0321723}, {-0.456, 0.0322448}, {-0.444, > 0.0321498}, > {-0.433, 0.032132}, {-0.422, 0.0321804}, {-0.411, 0.0322158}, > {-0.4, 0.0320886}, {-0.233, 0.0320596}} > > How do I do this? > > Thanks, > > Michael > -- > ------------------------------------------------------------ > Michael B. Heaney > 3182 Stelling Drive > Palo Alto, CA 94303 USA > mheaney at alum.mit.edu > www.linkedin.com/in/michaelbheaney > ------------------------------------------------------------