[R] Fitting a function

[Mario Valle]

Have you tried Eureqa?
http://ccsl.mae.cornell.edu/eureqa
It tries to discover the model from your data.
Try it, it is impressive (at least on my data).
Ciao!
		mario

On 14-May-10 15:07, Thomas Levine wrote:
> Actually, ignore my comment about that link. I don't think that link
> is what you want to look at either.
>
> y~x^2 fits quite well, but you could also write a loop to run lm() on
> a bunch of different transformations.
>
> foo=list(log,sqrt)
> for (bar in foo) {
> 	plot(bar(x),y)
> }
>
> There may be a function that does this already, but I couldn't find it either.
>
> Sorry for sending so many emails
>
> 2010/5/14 Thomas Levine<thomas.levine at gmail.com>:
>> I spoke too soon; that is not linear.
>>
>> I've never used the model-fitting functions, but you may check them out.
>> http://developer.r-project.org/model-fitting-functions.txt
>>
>> Tom
>>
>> 2010/5/14 Thomas Levine<thomas.levine at gmail.com>:
>>> x<-c(0.5,4,6,8,12)
>>> y<-c(0.021,0.021,0.020,0.018,0.012)
>>> lm(y~x)
>>>
>>> 2010/5/14 Dani Valverde<daniel.valverde at uab.cat>:
>>>> Hello,
>>>> It is a very naive question, but here it is. I have this values:
>>>>
>>>> x: 0.5 4 6 8 12
>>>>
>>>> y: 0.021 0.021 0.020 0.018 0.012
>>>>
>>>> I need to fit a function to them. How can I do it with R?
>>>> Thank you so much!
>>>>
>>>> Dani
>>>>
>>>> --
>>>> Daniel Valverde Saubí
>>>>
>>>> Grup de Biologia Molecular de Llevats
>>>> Facultat de Veterinària de la Universitat Autònoma de Barcelona
>>>> Edifici V, Campus UAB
>>>> 08193 Cerdanyola del Vallès- SPAIN
>>>>
>>>> Tlf. +34 93 581 1910
>>>> Fax: +34 93 581 1573
>>>>
>>>> ______________________________________________
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>>>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>
>>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

-- 
Ing. Mario Valle
Data Analysis and Visualization Group            | 
http://www.cscs.ch/~mvalle
Swiss National Supercomputing Centre (CSCS)      | Tel:  +41 (91) 610.82.60
v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax:  +41 (91) 610.82.82