<rkevinburton <at> charter.net> writes: > > ff <- complex(length(fs)) > ff[9] <- fs[9] > ff[5] <- fs[5] > > Include the DC component: > > ff[1] <- fs[1] > > Take the inverse > > fi <- fft(ff, inverse=TRUE) / length(ff) > > Plot > > plot(fi) > > Notice that the plot is the Re vs. Im on the x and y axis' respectively.
In one case, you plot a complex vector (gives points in complex plane), in the other case a time series, where default assumption with a warning is to plot the real part only. Try plot(as.ts(fi)) and you see the latter, where implicitely plot.ts is called. Dieter ______________________________________________ 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.
