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MathGroup Archive 2002

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Re: Solve weirdness

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35015] Re: Solve weirdness
  • From: Matthias.Bode at oppenheim.de
  • Date: Thu, 20 Jun 2002 02:13:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello js,

if we read

"Solve[{k*.01^p====10,k*.1^====1},{k,p}]"
as
Solve[{k*0.01^p====10,k*0.1^p====1},{k,p}]
and use
Solve[{Log[k] + Log[0.01]*p ==== Log[10], Log[k] + Log[0.1]*p ==== Log[1]},=
 {p,
    k}]
we get
{{p -> -1., k -> 0.1}}.

Solve is to be used for polynomials, cf. the Help Browser.

Best regards,
Matthias Bode
Sal. Oppenheim jr. & Cie. KGaA
Koenigsberger Strasse 29
D-60487 Frankfurt am Main
GERMANY
Tel.: +49(0)69 71 34 53 80
Mobile: +49(0)172 6 74 95 77
Fax: +49(0)69 71 34 95 380
E-mail: matthias.bode at oppenheim.de
Internet: http://www.oppenheim.de



-----Urspr=C3=BCngliche Nachricht-----
Von: Joshua A. Solomon [mailto:J.A.Solomon at city.ac.uk]
Gesendet: Mittwoch, 19. Juni 2002 11:53
An: mathgroup at smc.vnet.net
Betreff: [mg35001] Solve weirdness


shouldn't

Solve[{k*.01^p====10,k*.1^====1},{k,p}]

produce
{{k->10.,p->-1.}}

? it doesn't. it produces

{{}}

. what's up with that?

js
--
Joshua A. Solomon
Department of Optometry and Visual Science
City University
London EC1V 0HB
Voice: (44) 20 7040 0192
Fax: (44) 20 7040 0182
J.A.Solomon at city.ac.uk
http://www.staff.city.ac.uk/~solomon



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