freqz  R Documentation 
Compute the zplane frequency response of an ARMA model or IIR filter.
## Default S3 method:
freqz(filt = 1, a = 1, n = 512, region = NULL, Fs = 2 * pi, ...)
## S3 method for class 'Arma'
freqz(filt, ...)
## S3 method for class 'Ma'
freqz(filt, ...)
## S3 method for class 'freqz'
print(x, ...)
## S3 method for class 'freqz'
plot(x, ...)
## Default S3 method:
freqz_plot(w, h, ...)
## S3 method for class 'freqz'
freqz_plot(w, ...)
filt 
for the default case, the movingaverage coefficients of
an ARMA model or filter. Generically, 
a 
the autoregressive (recursive) coefficients of an ARMA filter. 
n 
number of points at which to evaluate the frequency response. 
region 

Fs 
sampling frequency in Hz. If not specified, the frequencies are in radians. 
w 
for the default case, the array of frequencies. Generically,

h 
a complex array of frequency responses at the given frequencies. 
x 
object to be plotted. 
... 
for methods of 
For fastest computation, n
should factor into a small number of
small primes.
When results of freqz
are printed, freqz_plot
will be
called to display frequency plots of magnitude and phase. As with
lattice
plots, automatic printing does not work inside loops and
function calls, so explicit calls to print
or plot
are
needed there.
For freqz
list of class freqz
with items:
h 
complex array of frequency responses at those frequencies. 
f 
array of frequencies. 
Original Octave version by John W. Eaton. Conversion to R by Tom Short.
Octave Forge https://octave.sourceforge.io/
filter
, Arma
, freqs
b < c(1, 0, 1)
a < c(1, 0, 0, 0, 0.25)
freqz(b, a)
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