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>*Reply-to*: hemphill at alumni.caltech.edu

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