File mtt/lib/examples/Mechanical/Mechanical-2D/TwoLink/twolink_simp.r from the latest check-in

%% Reduce comands to simplify output for system twolink (twolink_simp.r)

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% %% Version control history
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% %% $Id$
% %% $Log$
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%simplify the output equations
% Joint  angles
mttx2 := theta_1;
mttx4 := theta_1 + theta_2;
END;