MathGroup Archive 2001

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

Search the Archive

NSolve problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27541] NSolve problem
  • From: AGUIRRE ESTIBALEZ Julian <mtpagesj at lg.ehu.es>
  • Date: Sat, 3 Mar 2001 03:40:26 -0500 (EST)
  • Organization: Universidad del Pais Vasco/Euskal Herriko Unibertsitatea
  • Sender: owner-wri-mathgroup at wolfram.com

Dear Group,

The following computation involving finding the roots of a fairly
"large" polynomial produces these effects on an iMac and a G4 running
version 4.0.1.0

* The kernel quits inmediatly
* The Finder announces a type 2 or type 3 error
* The computer hangs when quitting the frontend or restarting

Before finding this problem, I have succefully solved thousands of similar
equations. It is only this particular polynomial that produces this
behaviour.

poly =
-379610373 +
86108525122 x -
9494410812843 x^2 + 
678033800618890 x^3 -
35256637347077513 x^4 + 
1422785868781829532 x^5 -
46379987523224586918 x^6 + 
1255110040775305672800 x^7 -
28757943661703317295081 x^8 + 
566216540434141788242036 x^9 -
9689635918166905495882851 x^10 + 
145419622102662664506687100 x^11 - 
1927635748101251322270468277 x^12 + 
22698320261526730755198553574 x^13 - 
238516616444064255358326013794 x^14 + 
2244844544457248209076495840902 x^15 - 
18977700242148569406030260324295 x^16 + 
144425378677250071307785407099514 x^17 - 
991008485501837267612722683739742 x^18 + 
6137577944863948353668001351379085 x^19 - 
34326439784958730341338590620522553 x^20 + 
173372427244970231511243462159022530 x^21 - 
790386259690389861011499411484727356 x^22 + 
3249150512801263497674821800877444750 x^23 - 
12025273387738045949766927419057733779 x^24 + 
39983125143255083338516711567117321554 x^25 - 
119092149085329990604796332906238009003 x^26 + 
316623088476789267411001214031813664920 x^27 - 
747964023676923486311300650584136934167 x^28 + 
1561105298212051506376403179694366814908 x^29 - 
2858356540987341736071315091852197268914 x^30 + 
4550488627005201158356170201262005359426 x^31 - 
6227602171254861022800069187941498698916 x^32 + 
7219321171308545919834020175759542752800 x^33 - 
6950806520792700621314978752272893634603 x^34 + 
5408604513390527799203743488644413596831 x^35 - 
3267975175700805824009526616434042764990 x^36 + 
1438562129094179414396635651311443079894 x^37 - 
410398690910611254706353259635396975000 x^38 + 
56948086997945333979944420780869994640 x^39;

NSolve[poly==0,x,100]


Julian Aguirre			| Voice:  +34 946012659
Departamento de Matematicas	| Fax:    +34 944648500
Universidad del Pais Vasco	| Postal: Aptdo. 644, 48080 Bilbao, Spain
				| email:  mtpagesj at lg.ehu.es



  • Prev by Date: New MathSource packages
  • Next by Date: Re: Cobweb Plot
  • Previous by thread: New MathSource packages
  • Next by thread: Re: NSolve problem