[R] Odp: newbie nls question

From: Petr PIKAL <petr.pikal_at_precheza.cz>
Date: Wed, 11 Jun 2008 09:42:43 +0200

Hi

r-help-bounces_at_r-project.org napsal dne 11.06.2008 00:56:19:

> I'm tyring to fit a relatively simple nls model to some data, but keep
coming
> up against the same error (code follows):
>
> Oto=nls(Otolith ~ Linf*(1-exp(-k(AGE-to))),
> data = ages,
> start = list(Linf=1000, k=0.1, to=0.1),
> trace = TRUE)
>
> The error message I keep getting is "Error in eval(expr, envir, enclos)
:
> could not find function "k"". I've used this line of code for other nls

> models (with different data, parameter estimates, etc.), but have never
gotten
> this error. The data is

Does

 Oto=nls(Otolith ~ Linf*(1-exp(-k*(AGE-to))),

     data = ages, 
     start = list(Linf=1000, k=0.1, to=0.1), 
     trace = TRUE) 

help?

Regards
Petr

>
> AGE,Otolith,Scale
> 1,207.1052632,207.1052632
> 2,329.962963,332.7586207
> 3,401.9473684,406
> 4,422,413.1111111
> 5,452.6785714,458.34375
> 6,510.75,533
> 7,477,674
> 8,643,704
> 9,,615
> 10,695.5,
> 12,615,
>
> Are the missing values (e.g., no value for Otolith, AGE 9) having an
effect?
> I am using Tinn-R as an editor
>
> I'm new to R, trying to get away from Rcmdr (though it has been
helpful), and
> still trying to learn the language with the aid of several books on the
R. A
> search of the R Archive did not prove fruitful.
>
> Thanks in advance,
>
> SR
>
> Steven H. Ranney
> Graduate Research Assistant (Ph.D)
> USGS Montana Cooperative Fishery Research Unit
> Montana State University
> PO Box 173460
> Bozeman, MT 59717-3460
>
> phone: (406) 994-6643
> fax: (406) 994-7479
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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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.



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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. Received on Wed 11 Jun 2008 - 10:08:24 GMT

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