Re: FinFit question

*To*: mathgroup at smc.vnet.net*Subject*: [mg54850] Re: [mg54816] FinFit question*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Fri, 4 Mar 2005 05:07:46 -0500 (EST)*Reply-to*: hanlonr at cox.net*Sender*: owner-wri-mathgroup at wolfram.com

I get the same bad result in Version 5.1.1 for both NonlinearFit and FindFit (error message indicates NonlinearFit is calling FindFit, i.e., both have error message FindFit::nrlnum) $Version 5.1 for Mac OS X (January 27, 2005) Needs["Statistics`NonlinearFit`"]; points= {{23400,273.2},{6800,298.2},{2400,323.2}}; NonlinearFit[points,B/Log[R/Ro],R,{B,Ro}] 1556.9062702439037/Log[-0.014815259914646271*R] B/Log[R/Ro] /. FindFit[points,B/Log[R/Ro],{B,Ro},R] 1556.9062702439037/Log[-0.014815259914646271*R] Bob Hanlon > > From: Zsolt Regály <zs.regaly at icsip.elte.hu> To: mathgroup at smc.vnet.net > Date: 2005/03/02 Wed PM 10:29:06 EST > To: mathgroup at smc.vnet.net > Subject: [mg54850] [mg54816] FinFit question > > 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) > >