File mttroot/mtt/lib/examples/Mechanical/Mechanical-2D/gTwoLink/twolink_params.r artifact eb6c0cbeba part of check-in f0b48da817

%% Parameter file for system twolink (twolink_params.r)
%% This file provides symbolic parameters for simplification

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% $Id$
% %% $Log$
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% Useful trig simplifications


        trig1 := {cos(~x)*cos(~y) => (cos(x+y)+cos(x-y))/2,
                  cos(~x)*sin(~y) => (sin(x+y)-sin(x-y))/2,
                  sin(~x)*sin(~y) => (cos(x-y)-cos(x+y))/2,
                  cos(~x)^2       => (1+cos(2*x))/2,
                  sin(~x)^2       => (1-cos(2*x))/2};
       LET trig1;

% Some simplifications -- see book
j := m*l*l/3;

END;