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

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

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