control.evalfr

control.evalfr(sys, x)

Evaluate the transfer function of an LTI system for a single complex number x.

To evaluate at a frequency, enter x = omega*j, where omega is the frequency in radians

Parameters

• sys (StateSpace or TransferFunction) – Linear system

• x (scalar) – Complex number

Returns

fresp

Return type

ndarray

See also

freqresp, bode

Notes

This function is a wrapper for StateSpace.evalfr and TransferFunction.evalfr.

Examples

>>> sys = ss("1. -2; 3. -4", "5.; 7", "6. 8", "9.")
>>> evalfr(sys, 1j)
array([[ 44.8-21.4j]])
>>> # This is the transfer function matrix evaluated at s = i.

Todo

Add example with MIMO system