s-plane frequency response
Compute the s-plane frequency response of an ARMA model (IIR filter).
## Default S3 method: freqs(filt = 1, a = 1, W, ...) ## S3 method for class 'Arma' freqs(filt, ...) ## S3 method for class 'Ma' freqs(filt, ...) ## S3 method for class 'freqs' print(x, ...) ## S3 method for class 'freqs' plot(x, ...) ## Default S3 method: freqs_plot(w, h, ...) ## S3 method for class 'freqs' freqs_plot(w, ...)
filt |
for the default case, the moving-average coefficients of
an ARMA model or filter. Generically, |
a |
the autoregressive (recursive) coefficients of an ARMA filter. |
W |
the frequencies at which to evaluate the model. |
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. |
... |
additional arguments passed through to |
When results of freqs are printed, freqs_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 are
needed there.
For freqs list of class freqs with items:
H |
array of frequencies. |
W |
complex array of frequency responses at those frequencies. |
Original Octave version by Julius O. Smith III. Conversion to R by Tom Short.
b <- c(1, 2) a <- c(1, 1) w <- seq(0, 4, length=128) freqs(b, a, w)
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