How do you draw a position vector and a projection vector?

For ex. Draw the position vector OP if P(2,3,-4), then draw the projection of OP onto the xy plane.|||for OP draw a line from the origin to the point P



the projection vector of OP onto the z = 0 plane is %26lt; 2 , 3 , 0 %26gt; , again



from the origin to the point ( 2 , 3 , 0 )