Re: simple question about removing elements from a table

*To*: mathgroup at smc.vnet.net*Subject*: [mg122383] Re: simple question about removing elements from a table*From*: Tomas Garza <tgarza10 at msn.com>*Date*: Thu, 27 Oct 2011 06:29:29 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201110262137.RAA29967@smc.vnet.net>

Try In[1]:= 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}}; In[2]:= DeleteCases[data, x_ /; x[[1]] > 0] Out[2]= {{-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}} -Tomas > Date: Wed, 26 Oct 2011 17:37:09 -0400 > From: mheaney at gmail.com > Subject: simple question about removing elements from a table > To: mathgroup 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 > ------------------------------------------------------------

**References**:**simple question about removing elements from a table***From:*"Michael B. Heaney" <mheaney@gmail.com>