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Re: NSolve...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg119895] Re: NSolve...
  • From: Heike Gramberg <heike.gramberg at gmail.com>
  • Date: Tue, 28 Jun 2011 07:56:53 -0400 (EDT)
  • References: <201106271133.HAA07943@smc.vnet.net>

You need to enclose your equations within curly brackets, i.e.

NSolve[{confr2PR, confr3PR, confr4PR}, {a, b, Subscript[V, c]}]

out:

{{a -> -365.657, b -> 0.0731421,
  Subscript[V, c] -> 0.158833}, {a -> 0., b -> -0.585136,
  Subscript[V, c] -> -0.242371}, {a -> 0., b -> -0.585136,
  Subscript[V, c] -> -0.242371}}

Heike.

On 27 Jun 2011, at 12:33, Math Math wrote:

>
> Hi to everyone,
> I've got another problem with NSolve.
> If i try to solve this system:
> confr2PR=-0.00013555094682336357*(-2528.68036936 - 13488.85542739007*b)
> - 3*Subscript[V, c] == 0
> confr3PR=-0.00013555094682336357*(-a + 2094.827407791039*b
> + 7377.300000000003*b^2) + 3*Subscript[V, c]^2 == 0
> confr4PR=-0.00013555094682336357*b*(a - 433.8529615689614*b -
> 1265.7445726099324*b^2) -Subscript[V, c]^3 == 0
> I've got no solutions.
> This is the sintax that i'm using:
> NSolve[confr2PR, confr3PR, confr4PR, {a, b, Subscript[V, c]}]
> and i've this message:
> NSolve::bddom: "Value {a,b,Subscript[V, c]} of the domain argument should be
> Complexes, Reals, Algebraics, Rationals, Integers, Primes, or Automatic"
> If i put
> NSolve[confr2PR, confr3PR, confr4PR, {a, b, Subscript[V, c]},Reals]
> i've got another error message
> NSolve::precbd: Requested precision Reals is not a machine-sized real number
> between $MinPrecision and $MaxPrecision. >>
> Can anyone help me?
> Thank you!



  • References:
    • NSolve...
      • From: Math Math <mathematica023@gmail.com>
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