[R] fitting periodic 'sine wave' model
ggrothendieck at gmail.com
Tue Jun 10 16:33:18 CEST 2008
RSiteSearch("fit a sine")
On Tue, Jun 10, 2008 at 10:25 AM, Jon Loehrke <jloehrke at umassd.edu> wrote:
> I have been attempting to estimate the periodic contribution of an effect to
> some data but have not been able to fit a sine wave within R.
> It would be nice to start by being able to fit a sine wave with an amplitude
> and frequency.
> y<-2*sin(2*pi*.5*x) #amplitude =2, frequency=0.5
> # This failed to converge
> r<-nls(y ~ A*sin(2*pi*F*x), start=list(A = 1, F = 1), trace=T)
> # even this gave a max iteration error
> r<-nls(y ~ A*sin(2*pi*F*x), start=list(A = 1, F = .5), trace=T)
> I have a feeling I am approaching this incorrectly. Thank you all very much
> for the guidance.
> R 2.7.0
> mac os 10.5
> Jon Loehrke
> Graduate Research Assistant
> Department of Fisheries Oceanography
> School for Marine Science and Technology
> University of Massachusetts
> 200 Mill Road, Suite 325
> Fairhaven, MA 02719
> jloehrke at umassd.edu
> T 508-910-6393
> F 509-910-6396
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
More information about the R-help