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    %% Frequency-Limited Hankel Singular Values
% Compute the Hankel singular values of a model with low-frequency and
% high-frequency dynamics.  Focus the calculation on the high-frequency
% modes.
%%
% Load the model and examine its frequency response.
load modeselect Gms
bodeplot(Gms)
%%
% |Gms| has two sets of resonances, one at relatively low frequency and the
% other at relatively high frequency.  Compute the Hankel singular values
% of the high-frequency modes, excluding the energy contributions to the
% low-frequency dynamics. To do so, use |hsvdOptions| to specify a
% frequency interval  above 30 rad/s. 
opts = hsvdOptions('FreqInterval',[30 Inf]);
hsvd(Gms,opts)