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%% Largest Eigenvalue Pairs of Sparse Matrix % west0479 is a real-valued 479-by-479 sparse matrix with both real and % complex pairs of conjugate eigenvalues. |eig| computes all 479 % eigenvalues. |eigs| easily picks out the largest magnitude eigenvalues. %% % This plot shows the 8 largest magnitude eigenvalues of west0479 as % computed by |eig| and |eigs|. % Copyright 2015 The MathWorks, Inc. load west0479 d = eig(full(west0479)); dlm = eigs(west0479,8); [dum,ind] = sort(abs(d)); plot(dlm,'k+') hold on plot(d(ind(end-7:end)),'ks') hold off legend('eigs(west0479,8)','eig(full(west0479))')