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v2007.09.13 - Convex Optimization

v2007.09.13 - Convex Optimization

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548 APPENDIX C. SOME ANALYTICAL OPTIMAL RESULTSwhere step function ψ is defined in (1360). In this circumstance,S ⋆ = U A U H B = R ⋆T ∈ C n×n (1522)optimal matrices (1513) now unitary are related by transposition.optimal value of objective (1514) isThe‖U A Σ A Q H A − S ⋆ U B Σ B Q H B R ⋆ ‖ F = ‖ |Υ| − |Λ| ‖ F (1523)while the corresponding optimal value of trace maximization (1515) isC.4.2.2supR H =R −1S H =S −1 Re tr(A T SBR) = tr(|Υ| |Λ|) (1524)Diagonal matricesNow suppose A and B are diagonal matricesA = Υ = δ 2 (Υ) ∈ S n , δ(Υ) ∈ K M (1525)B = Λ = δ 2 (Λ) ∈ S n , δ(Λ) ∈ K M (1526)both having their respective main diagonal entries arranged in nonincreasingorder:minimize ‖Υ − SΛR‖ FR , Ssubject to R H = R −1(1527)S H = S −1Then we have a symmetric decomposition from unitary matrices as in (1519)whereU A ∆ = √ δ(ψ(δ(Υ))) , Q A ∆ = √ δ(ψ(δ(Υ))) H , Σ A = |Υ| (1528)U B ∆ = √ δ(ψ(δ(Λ))) , Q B ∆ = √ δ(ψ(δ(Λ))) H , Σ B = |Λ| (1529)Procrustes solution (1513) again sees the transposition relationshipS ⋆ = U A U H B = R ⋆T ∈ C n×n (1522)but both optimal unitary matrices are now themselves diagonal. So,S ⋆ ΛR ⋆ = δ(ψ(δ(Υ)))Λδ(ψ(δ(Λ))) = δ(ψ(δ(Υ)))|Λ| (1530)

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