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Re: How can I get better solution for this...?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120038] Re: How can I get better solution for this...?
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Thu, 7 Jul 2011 07:27:30 -0400 (EDT)
  • References: <201107060939.FAA29377@smc.vnet.net>
  • Reply-to: drmajorbob at yahoo.com

Solve[{sx^2 (1 + gx gy)^2 + sx^2 gy^2 == p00,
   sx sy gx (1 + gx gy) + sx sy gy == p01, sy^2 (1 + gx^2) == p11,
   sx sy == d}, {p00, p01, p11, d}]

{{p00 -> sx^2 + 2 gx gy sx^2 + gy^2 sx^2 + gx^2 gy^2 sx^2,
   p01 -> gx sx sy + gy sx sy + gx^2 gy sx sy, p11 -> (1 + gx^2) sy^2,
   d -> sx sy}}

Bobby

On Wed, 06 Jul 2011 04:39:55 -0500, sid <siddys at gmail.com> wrote:

> Hi all,
>     I am trying to solve the following for {sx,sy,gx,gy}
>
>      sx^2 (1 + gx gy)^2 + sx^2 gy^2 = P00 ........(1)
>      sx sy gx (1 + gx gy) + sx sy gy = P01 .......(2)
>      sy^2 ( 1 + gx^2) = P11 ...............................(3)
>      sx sy  = D ................................................(4)
>
> in terms of P00,P01,P11, and D.
>
> When I use Solve[] , I get a huge output containing the P terms up
> till the order of 16 (i.e P00^16 etc..), which
> I know is not correct. I do not think I am specifying the problem
> correctly, and being a non-expert in Mathematica, would appreciate
> some help. Specifically
> 1) should I specify the simultaneous equation using && operator? I
> have tried it, and I get different (but huge) output
> 2) can I break the problem into parts? how?
> Thanks,
> s.
>


-- 
DrMajorBob at yahoo.com


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