function traj_plot( M )

plot3( M( :, 1 ), M( :, 3 ), M( :, 2 ) );

xlabel( 'X' );
ylabel( 'Z' );
zlabel( 'Y' );

axis( [ -2, 4, 0, 6, -2, 4 ] );

view( [-0.4, -0.4, 1 ] );