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    %% Passivity of N-port S-parameter Data
% Convert |passive.s2p| Touchstone file to an nport object. 
nobj = nport('passive.s2p');
%%
% Convert the n-port object, |nobj| to s-parameter object.
sobj = sparameters(nobj)
%%
% Find the passivity of n-port sparameter data at impedance value, 60.
ispassive(sobj.Parameters,'Impedance',60)