buttap | R Documentation |
Return the poles and gain of an analog Butterworth lowpass filter prototype.
buttap(n)
n |
Order of the filter. |
This function exists for compatibility with 'Matlab' and 'Octave' only, and
is equivalent to butter(n, 1, "low", "s")
.
List of class Zpg
containing poles and gain of the
filter.
Carne Draug, carandraug+dev@gmail.com.
Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com.
## 9th order Butterworth low-pass analog filter
zp <- buttap(9)
w <- seq(0, 4, length.out = 128)
freqs(zp, w)
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