signal (version 0.7-6)

zplane: Pole-zero plot

Description

Plot the poles and zeros of a model or filter.

Usage

# S3 method for default
zplane(filt, a, …)
# S3 method for Arma
zplane(filt, …)
# S3 method for Ma
zplane(filt, …)
# S3 method for Zpg
zplane(filt, …)

Arguments

filt

for the default case, the moving-average coefficients of an ARMA model or filter. Generically, filt specifies an arbitrary model or filter operation.

a

the autoregressive (recursive) coefficients of an ARMA filter.

…

Additional arguments passed to plot.

Value

No value is returned.

Details

Poles are marked with an ‘x’, and zeros are marked with an ‘o’.

References

Octave Forge http://octave.sf.net

http://en.wikipedia.org/wiki/Pole-zero_plot

See Also

Arma, freqz

Examples

# NOT RUN {
filt <- ellip(5, 0.5, 20, .2)
zplane(filt)
# }