Re: parameters problem in FindFit
- To: mathgroup at smc.vnet.net
- Subject: [mg92876] Re: parameters problem in FindFit
- From: annetts729 <davidannetts at aapt.net.au>
- Date: Thu, 16 Oct 2008 05:06:18 -0400 (EDT)
- References: <gd4dl4$bg2$1@smc.vnet.net>
Hi,
Hi,
> Hi, guys :
> I get a list like this :
> lis = {{12.5, 1.146}, {32, 1.145}, {50,
> 1.144}, {69, 1.1424}, {84.6,
> 1.139}}
> My aim is :
> FindFit[lis,
> a - (b x^2)/(c + x), {{a, 1.14}, {b, 0.0003}, {c, 300}}, x]
> As we can see, I want this list to be fitted using parameters a, b, c
> around 1.14, 0.0003, 300. However Mathematica gives { b, 10^8} and {c,
> 10^14} far from what I expect.I set "MaxIterations" to less times,
> but it doesn' t make sense.
> My friends didn't give the answer either, I am here for your advice.
> Thanks in advance.
Did you look at FindFit's Method option?
Regards,
Dave.