butter  R Documentation 
Generate Butterworth filter polynomial coefficients.
## Default S3 method:
butter(n, W, type = c("low", "high", "stop", "pass"),
plane = c("z", "s"), ...)
## S3 method for class 'FilterOfOrder'
butter(n, ...)
n 
filter order or generic filter model 
W 
critical frequencies of the filter. 
type 
Filter type, one of 
plane 

... 
additional arguments passed to 
Because butter
is generic, it can be extended to accept other
inputs, using "buttord"
to generate filter criteria for example.
An Arma
object with list elements:
b 
moving average (MA) polynomial coefficients 
a 
autoregressive (AR) polynomial coefficients 
Original Octave version by Paul Kienzle pkienzle@user.sf.net. Modified by Doug Stewart. Conversion to R by Tom Short.
Proakis & Manolakis (1992). Digital Signal Processing. New York: Macmillan Publishing Company.
https://en.wikipedia.org/wiki/Butterworth_filter
Octave Forge https://octave.sourceforge.io/
Arma
, filter
, cheby1
,
ellip
, and buttord
bf < butter(4, 0.1)
freqz(bf)
zplane(bf)
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