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From: Zhu Sha Zang <zhushazang@gmail.com>
Newsgroups: comp.soft-sys.math.mathematica
Subject: Re: Running problem in DSolve
Date: Mon, 6 Jan 2014 07:29:36 +0000 (UTC)
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Hello there, excuse me. I'm a new user of Wolfram Mathematica software
and have two doubts here.

1) What the meaning of using AA'[x]? Ok, the meaning of entire
equation like AA'[x] + I*b*EE[x] + c*CC[x] + d*AA[x] == 0?

2) How to made Mathematica use more than on processor? In fact the
problem explained here are running in only one of mine 4 cores. Are
there a way to force Mathematica make use of the entire power in my
computer. Maybe we can accelerate DSolve proccess. To clarify, i'm
using 64-bit linux version.

Best regards

Em 05-01-2014 08:27, saha18swarup@gmail.com escreveu:
> Dear Expert, I have some problem running Mathematica  and it is
> taking too much time. Can you help me?
> 
> Regards Swarup
> 
> eqns = {AA'[x] + I*b*EE[x] + c*CC[x] + d*AA[x] == 0, BB'[x] -
> a*CC[x] + I*b*FF[x] - c*DD[x] + d*BB[x] == 0, CC'[x] + a*BB[x] +
> I*b*GG[x] + c*AA[x] + d*CC[x] == 0, DD'[x] + I*b*HH[x] - c*BB[x] +
> d*DD[x] == 0, EE'[x] + I*b*AA[x] - c*GG[x] - I*e*BB[x] + d*EE[x] ==
> 0, FF'[x] - a*GG[x] + I*b*BB[x] + c*HH[x] - I*e*AA[x] + d*FF[x] ==
> 0, GG'[x] + a*FF[x] + I*b*CC[x] - c*EE[x] - I*e*DD[x] + d*GG[x] ==
> 0, HH'[x] + I*b*DD[x] + c*FF[x] - I*e*CC[x] + d*HH[x] == 0}
> 
> ic = {AA[0] == 1, BB[0] == 0, CC[0] == 0, DD[0] == 0, EE[0] == 1, 
> FF[0] == 0, GG[0] == 0, HH[0] == 0}
> 
> DSolve[{eqns, ic}, {AA, BB, CC, DD, EE, FF, GG, HH}, x]
> 


- -- 
- ---
Rodolfo T. da Silva