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Re: Mathematica issue

  • To: mathgroup at smc.vnet.net
  • Subject: [mg127855] Re: Mathematica issue
  • From: Matthias Bode <lvsaba at hotmail.com>
  • Date: Sun, 26 Aug 2012 23:36:39 -0400 (EDT)
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  • Delivered-to: l-mathgroup@wolfram.com
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Hola:
As neither Solve[] nor Reduce[] find an analytical solution there isn't any - most probably.
One might, however, do - inter alia - this:
Clear[a0, a1, b0, b1, c0, d0, eq01, sol01]eq01 = Expand[a0 + b0 +            x^a1*(c0 - d0*x^b1) == 0]; sol01 = FindInstance[eq01, {a0, b0, c0, d0,        a1, b1, x}, Reals]a0 + b0 + x^a1*(c0 - d0*x^b1) == 0 /. sol01N[sol01]
Out[3]= {{a0 -> (46314691670528 - 1684956133536*              134^(7/10) - 15*134^(4/5))/         57893364588160, b0 -> -(4/5),      c0 -> 39/10, d0 -> -(3/2),      a1 -> -(3/10), b1 -> -(49/10), x -> 134}}
Out[4]= {True}
Out[5]= {{a0 -> -0.09729070208467958, b0 -> -0.8,      c0 -> 3.9, d0 -> -1.5, a1 -> -0.3,      b1 -> -4.9, x -> 134.}}
Best regards,
MATTHIAS BODE
S 17.35775=B0, W 066.14577=B0
2'740 m
AMSL.



> From: nma at 12000.org
> Subject: Re: Mathematica issue
> To: mathgroup at smc.vnet.net
> Date: Sun, 26 Aug 2012 05:45:30 -0400
>
> On 8/26/2012 3:18 AM, Nasser M. Abbasi wrote:
> >>
> >> I need analytical expression for the x in terms of A,B,C,D and a,b,
> >>
> >
> > try this:
> >
> > parms = {A0 -> 1, B0 -> 2, a -> 3, C0 -> 4, D0 -> 5, b -> 6}
> > eq    = A0 + B0 + x^a (C0 - D0 x^b) == 0
> > sol   = Solve[eq /. parms, x]
>
> Opps, just noticed you want symbolic solution.
> Mathematica 8.04 does not do it. I doubt this can be solved symbolically.
> Need to use some numbers for the parameters.
>
> Clear[A0, B0, a , C0, D0 , b]
> eq = A0 + B0 + x^a (C0 - D0 x^b) == 0
> Solve[eq, x]
>
> Solve::nsmet: This system cannot be solved with the methods available to =
Solve. >>
>
> --Nasser
>
>



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