function c = conj(a, F)% CONJ   Quaternion conjugate.% (Quaternion overloading of Matlab standard function.)%% Implements three different conjugates:%% conj(X) or% conj(X, 'hamilton') returns the quaternion conjugate.% conj(X, 'complex')  returns the complex conjugate.% conj(X, 'total')    returns the 'total' conjugate equivalent to%                     conj(conj(X, 'complex'), 'hamilton')% Copyright