You could use the 'nls' function to fit a sine (or cosine) function to the data.
On Fri, Jun 1, 2012 at 7:54 PM, Aaron Patterson <tenderl...@ruby-lang.org> wrote: > Hello! I'm collecting data on a refrigerator that I'm using to cure > meat. Specifically I am collection humidity and temperature readings. > The temperature readings look sinusoidal (due to the refrigerator > turning on and off). > > I'd like to calculate the frequency and period of the wave so that I can > determine if modifications I make to the equipment are increasing or > decreasing efficiency. Unfortunately, I'm pretty new to R, so I'm not > sure how to figure this out. I *suspect* I should be doing an fft on > the temperature data, but I'm not sure where to go from there. > > Here is a graph I'm producing: > > http://i.imgur.com/WpsDi.png > > Here is the program I have so far: > > https://github.com/tenderlove/rsausage/blob/master/graphing.r > > I have posted a repository with a SQLite database that has the data I've > collected here: > > https://github.com/tenderlove/rsausage > > Any help would be greatly appreciated! > > -- > Aaron Patterson > http://tenderlovemaking.com/ > > ______________________________________________ > R-help@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. > -- Gregory (Greg) L. Snow Ph.D. 538...@gmail.com ______________________________________________ R-help@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.
