eg_grav.m

% Copyright (C) 1993-2017, by Peter I. Corke
%
% This file is part of The Robotics Toolbox for MATLAB (RTB).
% 
% RTB is free software: you can redistribute it and/or modify
% it under the terms of the GNU Lesser General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
% 
% RTB is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU Lesser General Public License for more details.
% 
% You should have received a copy of the GNU Leser General Public License
% along with RTB.  If not, see <http://www.gnu.org/licenses/>.
%
% http://www.petercorke.com
theta = linspace(-pi, pi, 75);
[Q2,Q3] = meshgrid(theta, theta);
for i=1:numcols(Q2),
	for j=1:numcols(Q3);
		g = p560.gravload([0 Q2(i,j) Q3(i,j) 0 0 0]);
		g2(i,j) = g(2);
		g3(i,j) = g(3);
	end
end
surfl(Q2, Q3, g2); surfl(Q2, Q3, g3);