Impulse-response characteristics
Impulse-response characteristics of a discrete filter.
## Default S3 method:
impz(filt, a = 1, n = NULL, Fs = 1, ...)
## S3 method for class 'Arma'
impz(filt, ...)
## S3 method for class 'Ma'
impz(filt, ...)
## S3 method for class 'impz'
plot(x, xlab = "Time, msec", ylab = "", type = "l",
main = "Impulse response", ...)
## S3 method for class 'impz'
print(x, xlab = "Time, msec", ylab = "", type = "l",
main = "Impulse response", ...)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. |
n |
number of points at which to evaluate the frequency response. |
Fs |
sampling frequency in Hz. If not specified, the frequencies are in per unit. |
... |
for methods of |
x |
object to be plotted. |
xlab,ylab,main |
axis labels anmd main title with sensible defaults. |
type |
as in |
When results of impz are printed, the impulse response will be
plotted. 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 impz, a list of class impz with items:
x |
impulse response signal. |
t |
time. |
Original Octave version by Kurt Hornik and John W. Eaton. Conversion to R by Tom Short.
Octave Forge http://octave.sf.net
bt <- butter(5, 0.3) impz(bt) impz(ellip(5, 0.5, 30, 0.3))
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