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Re: Re: NSolve problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27674] Re: [mg27633] Re: [mg27541] NSolve problem
  • From: "Christopher J. Purcell" <purcell at drea.dnd.ca>
  • Date: Sat, 10 Mar 2001 00:50:12 -0500 (EST)
  • References: <200103030840.DAA23816@smc.vnet.net> <uGzp6.2249$96.11347@ralph.vnet.net> <200103090735.CAA12988@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In  under 1 second, this kills the Kernel on my Powerbook G3 Mac 
running MacOS 8.6, and Mathematica 4.0, no matter how much memory I 
throw at it. Then an Error 10 bomb. That is one rude polynomial you 
have created. When I plot poly, the effect of its large cancelling 
terms (that make it sensitive to numerical round-off error) are 
obvious. Using the third argument of NSolve did not help.


>My problem was that Mathematica crashed on an iMac and a G4 when
>evaluating NSolve[poly==0,x], where poly is given below. There have been
>several posts by Windows users saying that they found no problem. I would
>like to hear from MacIntosh users.
>
>	Thanks,
>
>	Julian Aguirre
>	Universidad del Pais Vasco
>
>>  > 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;

-- 
Dr. Christopher J. Purcell
GL/Trans
Defence Research Establishment Atlantic
9 Grove St., Dartmouth, NS Canada B2Y 3Z7

Tel: 902-426-3100-x389
Fax: 902-426-9654
E-mail: purcell at drea.dnd.ca


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