function vtb4% VTB4%% VTB4_1 Natural frequencies and eigenvectors for an undamped%        system.% VTB4_2 Free response of an undamped system.% VTB4_3 solves for the natural frequencies, damping ratios, %        and mode shapes of a linear second order matrix (LSOM)%        form system.  (M,C,K)