eig(a)
eigen
without computing the eigenvectors.compan
eig(matrix(c(1,-1,-1,1), 2, 2)) #=> 2 0
eig(matrix(c(1,1,-1,1), 2, 2)) # complex values
eig(matrix(c(0,1i,-1i,0), 2, 2)) # real values
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