Frequency Response Function

This function evaluates a rational matrix at one given (complex) arguments. It is the non-plural version of zvalues.

Usage

zvalue(obj, z, ...)

# S3 method for lpolm
zvalue(obj, z = NULL, ...)

# S3 method for polm
zvalue(obj, z = NULL, ...)

# S3 method for lmfd
zvalue(obj, z = NULL, ...)

# S3 method for rmfd
zvalue(obj, z = NULL, ...)

# S3 method for stsp
zvalue(obj, z = NULL, ...)

Arguments

obj

(rational) matrix object, i.e. a polm, lpolm, lmfd, rmfd, stsp object or an object which may be coerced to a polynomial matrix with polm(obj). The default S3 method first coerces the input argument obj to a polm object. If this fails an error is thrown.

z

(numeric or complex) vector of length one at which to evaluate the rational matrix.

...

optional additional parameters

Value

Matrix of dimensions of input object