returns an eigenvalue as a complex number . for symmetric matrices the returned eigenvalue will always be a real number , which means the imaginary component will be equal to zero . note : the order of the eigenvalues is dependent upon the decomposition algorithm used . this means that they may or may not be ordered by magnitude . for example the qr algorithm will returns results that are partially ordered by magnitude , but this behavior should not be relied upon . concode_field_sep DenseMatrix64F mat concode_elem_sep EigenDecomposition<DenseMatrix64F> eig concode_field_sep T getEigenVector concode_elem_sep EigenDecomposition getEVD concode_elem_sep int getNumberOfEigenvalues concode_elem_sep int getIndexMax concode_elem_sep int getIndexMin concode_elem_sep double quality