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Raw periodogram.
periodogram(y)
The raw data.
Periodogram is an estimate of the spectral density using FFT.
kzp,
kzp
# NOT RUN { t<-1:1000 f1<-0.3 f2<-0.4 noise<-15*rnorm(length(t)) s<-3*sin(2*pi*f1*t)+3*sin(2*pi*f2*t) plot(periodogram(s+noise),type='l') # }
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