This utility calculates vector sums and differences as discussed in section 3.2, and resolves a given vector into its components as explained in section 3.3. The "head to tail," or triangle, method of drawing two added vectors is used. For subtraction, the negative of vector B is added to vector A, as shown in Figure 3.9. Note that the graphic display works best when the magnitudes of the vectors are in the range of about 20 units to 200 units. Note also that for better display we have limited the x, y and amplitude values to 280, 150 and 310 respectively.