Graphic Representation Example D1=27+ 372+573 D2=37+D,=27+3,+57 2+73 Q=071+072+273 Q=07+072 +273 D2=371+772+73 Is D, or D, more similar to Q? How to measure the degree of similarity? Distance? Angle? Projection?11 Graphic Representation Example: D1 = 2T1 + 3T2 + 5T3 D2 = 3T1 + 7T2 + T3 Q = 0T1 + 0T2 + 2T3 T3 T1 T2 D1 = 2T1+ 3T2 + 5T3 D2 = 3T1 + 7T2 + T3 Q = 0T1 + 0T2 + 2T3 7 2 3 5 • Is D1 or D2 more similar to Q? • How to measure the degree of similarity? Distance? Angle? Projection?