You need to use view(3)
A = eye(4);
U = [ 0.866 -0.5 0 11 ; 0.5 0.866 0 -1 ; 0 0 1 9 ; 0 0 0 1];
ax = axes();
view(3);
hold on
trplot(U,'color','r')
trplot(A,'color','g')
% daspect([1 1 1]); % optional
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!