Enter in the edit box a matrix that defines the filter ranges IN RAD/S that will define the passband of the estimation focus. Several passbands can be defined by letting each row define a separate passband.
Example 1. Enhance the fit below 5 rad/s: Enter [0 5]
Example 2. Exclude the range [1 2] rad/s from the fit: Enter [0 1;2 100] (assuming the Nyquist frequency is 100 rad/s or less.)
Example 3. Focus the fit to the bands [1 2] rad/s and [5 6] rad/. Enter [1 2;5 6].
Alternatively the name of any valid focus variable (LTI object or IDMODEL object or a frequency domain weight vector; See IDPROPS ALGORITHM) can be entered. This variable must then exist in the workspace.