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v2009.01.01 - Convex Optimization

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414 CHAPTER 5. EUCLIDEAN DISTANCE MATRIX<br />

smallest eigenvalue<br />

1 2 3 4<br />

d 14<br />

-0.2<br />

-0.4<br />

-0.6<br />

Figure 108: Smallest eigenvalue of −VN TDV N<br />

only one value of d 14 : 2.<br />

makes it a PSD matrix for<br />

1.4<br />

1.2<br />

d 1/α<br />

ij<br />

log 2 (1+d 1/α<br />

ij )<br />

(a)<br />

1<br />

0.8<br />

0.6<br />

0.4<br />

0.2<br />

1−e −αd ij<br />

4<br />

0.5 1 1.5 2<br />

d ij<br />

3<br />

(b)<br />

2<br />

1<br />

d 1/α<br />

ij<br />

log 2 (1+d 1/α<br />

ij )<br />

1−e −αd ij<br />

0.5 1 1.5 2<br />

α<br />

Figure 109: Some entrywise EDM compositions: (a) α = 2. Concave<br />

nondecreasing in d ij . (b) Trajectory convergence in α for d ij = 2.

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