Just another remakr on this thread. I you have time series and think about its fourier transform (EE language) then you should know that the statistical language of that is "spectral analysis" or maybe "frequency domain time-series analysis" and the R function to consider should definitely be
spectrum() which is a wrapper (among others) to spec.pgram() -- which calls fft() -- for computing the so-called "periodogram". If you learn more about the topic, you will learn that in almost all cases you'd consider a *smoothed* version of the periodogram, etc etc (because the so-called *raw* periodgram is *in*consistent as an estimate fo the underlying true spectrum). The Time-Series chapter/section of the MASS book is very helpful here, IIRC. Martin Maechler, ETH Zurich >>>>> "OB" == Oliver Bandel <[EMAIL PROTECTED]> >>>>> on Thu, 4 Sep 2008 23:16:07 +0200 writes: OB> Zitat von Duncan Murdoch <[EMAIL PROTECTED]>: >> On 04/09/2008 4:44 PM, Oliver Bandel wrote: >> > Zitat von Duncan Murdoch <[EMAIL PROTECTED]>: >> > >> >> Oliver Bandel wrote: >> >>> Hello, >> >>> >> >>> OB> [...] >> plot3d doesn't support that directly, but you could plot with >> type='n', >> then use segments3d to add the lines. >> >> > >> > BTW: how to change the perspective? I did not found an >> > angle-parameter for the plot3d()-function. >> >> Just grab it with your mouse and drag. OB> Wow, coool! :-) OB> Well, rgl.... I think "gl" stands for OpenGl. OB> Fine. :-) >> Alternatively, >> play3d(spin3d()) >> will spin it, or par3d(userMatrix=rotationMatrix(...)) for a fixed >> setting. OB> Ok, some thinsg to play with. OB> Thank you. OB> Ciao, OB> Oliver OB> ______________________________________________ OB> R-help@r-project.org mailing list OB> https://stat.ethz.ch/mailman/listinfo/r-help OB> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html OB> and provide commented, minimal, self-contained, reproducible code. ______________________________________________ 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.