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MathGroup Archive 2012

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recursively solve equation and save the values only

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125788] recursively solve equation and save the values only
  • From: wyn smjy <wsmjy2012 at gmail.com>
  • Date: Mon, 2 Apr 2012 04:27:05 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Dear All,

I am new to Mathematica. I am trying to recursively solve equation and
saving the values into Table. Since I need the real solutions only so
I use Reduce.

The following is my code:

f = 5.68672 T + 6.46776 T^3

t = Table[i, {i, 0.2, 3, 0.2}]

sols = Table[Reduce[f == t[[i]], T, Reals], {i, Length[t]}] {T ==
0.0351204, T == 0.06995, T == 0.104221, T == 0.137708, T == 0.170237,
T == 0.201687, T == 0.231988, T == 0.26111, T == 0.289058, T ==
0.315857, T == 0.34155, T == 0.366188, T == 0.389828, T == 0.412529, T
== 0.434347}

The solution is OK as I compared it to other software as well. The
only thing that matters me is how to remove the T== , i.e. I just need
the solution and then to copy this into another table, say sols2 that
contains

sols2 = {0.0351204, 0.06995, 0.104221, T == 0.137708,.., 0.434347}

I tried the following: sols2 = T/.sols but produce the following
error:

sols2 = ReplaceAll::reps: ... is neither a list of replacement rules
nor a valid dispatch table, and so cannot be used for replacing. >>

Does anyone know how to remove the T==?

Thank you,

Wayan



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