created 08/26/97; revised 08/12/00, 07/22/03, 07/22/09
This chapter discusses how to multiply a vector by a real number (called scaling), and how this is used to construct unit vectors. Unit vectors are used to show direction in 3D space, and are essential for 3D graphics.
Change the elements of this column matrix: (3, 4)T so that the vector it represents is twice as long and remains pointing in the same direction. (Officially you don't know how to do this. Take a guess.)