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MathGroup Archive 2005

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FinFit question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54816] FinFit question
  • From: Zsolt Regály <zs.regaly at icsip.elte.hu>
  • Date: Wed, 2 Mar 2005 22:29:06 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi

I have used Mathematica 4.2 to solve this problem

    points = {{23400, 273.2}, {6800, 298.2}, {2400, 323.2}};
    T[R_] = NonlinearFit[points, B/Log[R/Ro], {R}, {B, Ro}];

wihich gives the result as

    4021.05/Log[105.49 R]


That is a good result, but when I try to do the same in Mathematica 5.0 
I get error messaeges and an other solutions, which is surely bad
 
    1556.90/Log[-0.014 R]

Why doesn't work FindFit for this function in Mathematica 5.0

Regards,
Zsolt Regaly (zs.regaly at astro.elte.hu)


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