Function File: [sys, n] = fitfrd (dat, n)

Function File: [sys, n] = fitfrd (dat, n, flag)

Fit frequency response data with a state-space system. If requested, the returned system is stable and minimum-phase.

Inputs

dat

LTI model containing frequency response data of a SISO system.

n

The desired order of the system to be fitted. n <= length(dat.w).

flag

The flag controls whether the returned system is stable and minimum-phase.

0

The system zeros and poles are not constrained. Default value.

1

The system zeros and poles will have negative real parts in the continuous-time case, or moduli less than 1 in the discrete-time case.

Outputs

sys

State-space model of order n, fitted to frequency response data dat.

n

The order of the obtained system. The value of n could only be modified if inputs n > 0 and flag = 1.

Algorithm
Uses SLICOT SB10YD by courtesy of NICONET e.V.

Package: control