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MathGroup Archive 2005

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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}}}



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