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    %% Raw Parameter Covariance for Identified Model Array  

% Copyright 2015 The MathWorks, Inc.


%% 
% Obtain the identified model array. 
load iddata1 z1;
sys1 = tfest(z1,2);
sys2 = tfest(z1,3);
sysarr = stack(1,sys1,sys2); 

%%
% |sysarr| is a 2-by-1 array of continuous-time, identified transfer functions.  

%% 
% Get the raw parameter covariance for the models in the array. 
cov_data = getcov(sysarr) 

%%
% |cov_data| is a 2-by-1 cell array. |cov_data{1}| and |cov_data{2}| are
% the raw parameter covariance matrices for |sys1| and |sys2|.