Re: List element extraction

*To*: mathgroup at smc.vnet.net*Subject*: [mg53485] Re: [mg53470] List element extraction*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Fri, 14 Jan 2005 08:54:30 -0500 (EST)*Reply-to*: hanlonr at cox.net*Sender*: owner-wri-mathgroup at wolfram.com

data = {{120.664, {x -> -4.64844}}, {118.131, {x -> -4.4542}}, {115.479, {x -> -4.25828}}, {112.697, {x -> -4.06053}}, {109.766, {x -> -3.8606}}, {106.666, {x -> -3.65812}}, {103.372, {x -> -3.45257}}, {99.8501, {x -> -3.24323}}, {96.0571, {x -> -3.02915}}, {91.9343, {x -> -2.80902}}, {87.3996, {x -> -2.58106}}, {82.3355, {x -> -2.34305}}, {76.5712, {x -> -2.09251}}, {69.8594, {x -> -1.8273}}, {61.8567, {x -> -1.54659}}, {52.1348, {x -> -1.25235}}, {40.3287, {x -> -0.952531}}, {26.7404, {x -> -0.66784}}, {13.703, {x -> -0.434276}}, {5.08285, {x -> -0.270745}}, {1.45243, {x -> -0.152066}}}; (x /. data[[All,2]])/2 {-2.32422,-2.2271,-2.12914,-2.03027,-1.9303,-1.82906,-1.72629, -1.62162,-1.\ 51458,-1.40451,-1.29053,-1.17153,-1.04626,-0.91365,-0.773295, -0.626175,-0.\ 476266,-0.33392,-0.217138,-0.135373,-0.076033} Bob Hanlon > > From: tdatta at physics.purdue.edu (Trinanjan Datta) To: mathgroup at smc.vnet.net > Date: 2005/01/13 Thu AM 03:12:14 EST > To: mathgroup at smc.vnet.net > Subject: [mg53485] [mg53470] List element extraction > > How do I extract the x values from the following list and divide them > by 2: > > {{120.664, {x -> -4.64844}}, { > 118.131, {x -> -4.4542}}, {115.479, {x -> -4.25828}}, { > 112.697, {x -> -4.06053}}, {109.766, {x -> -3.8606}}, { > 106.666, {x -> -3.65812}}, { > 103.372, {x -> -3.45257}}, {99.8501, {x -> -3.24323}}, { > 96.0571, {x -> -3.02915}}, { > 91.9343, {x -> -2.80902}}, {87.3996, {x -> -2.58106}}, { > 82.3355, {x -> -2.34305}}, {76.5712, {x -> -2.09251}}, { > 69.8594, {x -> -1.8273}}, {61.8567, {x -> -1.54659}}, { > 52.1348, {x -> -1.25235}}, {40.3287, {x -> -0.952531}}, { > 26.7404, {x -> -0.66784}}, {13.703, {x -> -0.434276}}, { > 5.08285, {x -> -0.270745}}, {1.45243, {x -> -0.152066}}}