% This example uses the n-D minimization approach (function minlfr). % It illustrates the problem due to the noncommutativity of the % uncertain parameters. lfrs d1 d2 d3 S1 = [d1*d2*d3;d2*d3*d1;d3*d1*d2]; S2 = [d1*d2*d3;d1*d2*d3;d1*d2*d3]; % minlfr is used for reducing the size of the Delta matrices: S1min = minlfr(S1); S2min = minlfr(S2); size(S1min); size(S2min); % In the first case Delta is 9-by-9 and in the second case 3-by-3. % However we have "minimal objects" in both cases. distlfr(S1min,S2min) % As a conclusion: commutativity must be taken into account % before realization (i.e. using symtreed).