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MathGroup Archive 2005

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Re: List element extraction

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53638] Re: List element extraction
  • From: highegg at centrum.cz (highegg)
  • Date: Fri, 21 Jan 2005 06:35:45 -0500 (EST)
  • References: <bkfutxi8t201@legacy>
  • Sender: owner-wri-mathgroup at wolfram.com

Cases[yourlist, {x -> a_} -> a/2, 2]

On 12 Jan 05 15:54:05 -0500 (EST), Trinanjan Datta wrote:
>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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