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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120043] Re: How can I get better solution for this...?
  • From: Siddharth Srivastava <siddys at gmail.com>
  • Date: Thu, 7 Jul 2011 07:28:24 -0400 (EDT)
  • References: <201107060939.FAA29377@smc.vnet.net>

Hi Bobby,
Thanks. I actually wanted sx, sy, gx and gy in terms of the P coeff. The solution you gave is just the equation that I wanted to solve!
#

On Wed, Jul 6, 2011 at 9:18 AM, DrMajorBob <btreat1 at austin.rr.com> wrote:

> 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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