gsignal (version 0.3-7)

tf2zp: Transfer function to zero-pole-gain form

Description

Convert digital filter transfer function parameters to zero-pole-gain form.

Usage

tf2zp(b, a)

Value

A list of class Zpg with the following list elements:

z

complex vector of the zeros of the model (roots of B(z))

p

complex vector of the poles of the model (roots of A(z))

g

overall gain (B(Inf))

Arguments

b

moving average (MA) polynomial coefficients, specified as a numeric vector or matrix. In case of a matrix, then each row corresponds to an output of the system. The number of columns of b must be less than or equal to the length of a.

a

autoregressive (AR) polynomial coefficients, specified as a vector.

Author

Geert van Boxtel,

See Also

filter

Examples

b <- c(2, 3)
a <- c(1, 1/sqrt(2), 1/4)
zpk <- tf2zp(b, a)