       Re: Big memory needed

• To: mathgroup at smc.vnet.net
• Subject: [mg110106] Re: Big memory needed
• From: Scott Hemphill <hemphill at hemphills.net>
• Date: Wed, 2 Jun 2010 02:04:37 -0400 (EDT)
• References: <htvbh0\$oln\$1@smc.vnet.net>

```Artur <grafix at csl.pl> writes:

> Dear Mathematica Gurus,
> I would like to ask somebody with big memory in computer (more than 4
> GB) to help me in solution following equation:
> Solve[{1/(2 p) (-c p^2 + b p^3 - p^6 + 2 c q + 3 p^4 q - 3 p^2 q^2 + 2 q^3 +
>        a^2 (-p^2 + q) - a (c - b p + 2 p^4 - 4 p^2 q + 3 q^2)) == d,
>   1/(4 p^2) (-c^2 + b^2 p^2 + a^2 p^4 + 2 a p^6 + p^8 -
>       2 b p^3 (a + p^2 - 2 q) - 4 a p^4 q - 4 p^6 q +
>       2 c (a + p^2 - q) q - a^2 q^2 - 2 a p^2 q^2 + 3 p^4 q^2 +
>       2 a q^3 + 2 p^2 q^3 - q^4) == e}, {p, q}]
>
>
> I need any p-> solution which will be Sqrt from polynomial 10 degree
> with coefficients  f(a,b,c,d,e)
> Solution for g isn't important for me.
>
> CoefficientList from polynomial 10 degree is sufficient for me. I will
> be very glad for any help!

Do you have any idea how much memory and computer time is required?

I finally gave up after 262 minutes of CPU time on an Intel Core 2 Quad
processor running at 3.6GHz.  I have a lot of virtual memory I could
throw at this problem, but only 8GB of RAM.  MathKernel had grown to
9889MB of virtual memory, but was only getting about 4% CPU usage
because it was thrashing.

Scott
--
Scott Hemphill	hemphill at alumni.caltech.edu
"This isn't flying.  This is falling, with style."  -- Buzz Lightyear

```

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