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v2009.01.01 - Convex Optimization

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E.9. PROJECTION ON CONVEX SET 685<br />

❇<br />

❇❇❇❇❇❇❇ x ❜<br />

❜<br />

R n⊥ ❇❙ ❜<br />

❇❇❇❇◗◗◗◗ ❙❙❙❙❙❙ ❜<br />

❜<br />

❜<br />

❜<br />

<br />

❜<br />

z<br />

❜<br />

y<br />

❜<br />

❜<br />

❜<br />

❜<br />

✧ ✧✧✧✧✧✧✧✧✧✧✧✧✧ R n<br />

❜<br />

❜<br />

C<br />

❜<br />

❜<br />

❜<br />

❜<br />

❜<br />

❜<br />

x −z ⊥ z −y ❜<br />

❇❜<br />

❇❇❇❇ ❜<br />

❜<br />

❜<br />

❜<br />

❜ ✧ ✧✧✧✧✧✧✧✧✧✧✧✧✧<br />

Figure 141: Closed convex set C belongs to subspace R n (shown bounded<br />

in sketch and drawn without proper perspective). Point y is unique<br />

minimum-distance projection of x on C ; equivalent to product of orthogonal<br />

projection of x on R n and minimum-distance projection of result z on C .

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