Windowing functions  R Documentation 
A variety of generally Matlab/Octave compatible filter generation functions, including Bartlett, Blackman, Hamming, Hanning, and triangular.
bartlett(n)
blackman(n)
boxcar(n)
flattopwin(n, sym = c('symmetric', 'periodic'))
gausswin(n, w = 2.5)
hamming(n)
hanning(n)
triang(n)
n 
length of the filter; number of coefficients to generate. 
w 
the reciprocal of the standard deviation for

sym 

triang
, unlike the bartlett window, does not go to zero at the
edges of the window. For odd n
, triang(n)
is equal to
bartlett(n+2)
except for the zeros at the edges of the window.
A main use of flattopwin
is for calibration, due
to its negligible amplitude errors. This window has low passband ripple, but high bandwidth.
Filter coefficients.
Original Octave versions by Paul Kienzle (boxcar
,
gausswin
, triang
) and Andreas Weingessel
(bartlett
, blackman
, hamming
, hanning
).
Conversion to R by Tom Short.
Oppenheim, A.V., and Schafer, R.W., DiscreteTime Signal Processing, Upper Saddle River, NJ: PrenticeHall, 1999.
Gade, S., Herlufsen, H. (1987) “Use of weighting functions in DFT/FFT analysis (Part I)”, Bruel & Kjaer Technical Review No. 3.
https://en.wikipedia.org/wiki/Windowed_frame
Octave Forge https://octave.sourceforge.io/
filter
, fftfilt
,
filtfilt
, fir1
n < 51
op < par(mfrow = c(3,3))
plot(bartlett(n), type = "l", ylim = c(0,1))
plot(blackman(n), type = "l", ylim = c(0,1))
plot(boxcar(n), type = "l", ylim = c(0,1))
plot(flattopwin(n), type = "l", ylim = c(0,1))
plot(gausswin(n, 5), type = "l", ylim = c(0,1))
plot(hanning(n), type = "l", ylim = c(0,1))
plot(hamming(n), type = "l", ylim = c(0,1))
plot(triang(n), type = "l", ylim = c(0,1))
par(op)
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