MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Why is equation set can't solve in Mathematica?


Perhaps you didn't wait long enough... I didn't have the time or
patience either.

But, let's have a closer look.

There are two equations for yx13b, so we may equate both right-hand
sides and solve for yx13a. It takes a couple of minutes and then
Mathematica finds a some huge answers (and a small one, 0). If you
enter these in the original equations you'll have yx13b.

Cheers -- Sjoerd


On May 11, 12:26 pm, Weber <a.pengw... at gmail.com> wrote:
> Hi, all. This problem is annoying
> This:
>
> Solve[{yx13b == (-dg sxa yx13a +
>     Sqrt[-dg dx1 sxa^2 yx13a + dg px013a sxa^2 yx13a -
>      dg hxa sxa^2 yx13a^2 - dg sxa vx13a yx13a^2])/(dg sxa),
>   yx13b == (-dx3 sxb + px013b sxb - 2 dg sxb yx13a - Sqrt[
>     4 dg sxb (-dg sxb - hxb sxb - vx13b) yx13a^2 + (-dx3 sxb +
>        px013b sxb - 2 dg sxb yx13a)^2])/(
>    2 (dg sxb + hxb sxb + vx13b))}, {yx13a, yx13b}]
>
> can't solve. Why?



  • Prev by Date: Re: Replace specific element with specific value.
  • Next by Date: Recovering data from DumpSave
  • Previous by thread: Why is equation set can't solve in Mathematica?
  • Next by thread: Help! 6 equation non-linear system