Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2003
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2003

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re:simple equation system -- crashing M5?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44282] Re:[mg44256] simple equation system -- crashing M5?
  • From: Rolf Mertig <rolf at mertig.com>
  • Date: Tue, 4 Nov 2003 03:23:54 -0500 (EST)
  • Reply-to: rolf at mertig.com
  • Sender: owner-wri-mathgroup at wolfram.com

>Has anyone had such an experience?? Any ideas??
I do not know how to use the built-in Solve or related functions to solve 
your system (though I am sure it is possible somehow).

However, one can just implement a modification (using Collect 
and a modification of Factor for intermediate results) of the 
"High-School-Algorithm" to solve this type of equations.

I have done this some time ago in Solve3.m of FeynCalc (since this type of
equations come up frequently in Feynman diagram and integrals calculations).

On a decent Linux machine Solve3 gets a  
result in about 6 minutes. Using Simplify to get a shorter result takes 
not more than 67 MB.
Since the result is somewhat longish (LeafCount is 176202) I put it here:

http://www.feyncalc.org/download/examples/solve3.m
http://www.feyncalc.org/download/examples/solve3.out

Regards,

Rolf Mertig

---

Mertig Consulting
http://www.mertig.com


  • Prev by Date: Re: Integrate...
  • Next by Date: Solving a matrix equation
  • Previous by thread: Re: Fw: Integrate...
  • Next by thread: Re: simple equation system -- crashing M5?