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v2004.06.19 - Convex Optimization

v2004.06.19 - Convex Optimization

v2004.06.19 - Convex Optimization

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CONTENTS 13E Pseudoinverse, Projection 383E.0.1 Logical deductions . . . . . . . . . . . . . . . . . . . . 384E.1 Idempotent matrices . . . . . . . . . . . . . . . . . . . . . . . 385E.1.1 Biorthogonal characterization . . . . . . . . . . . . . . 386E.1.2 Idempotence summary . . . . . . . . . . . . . . . . . . 389E.2 I − P , Projection on algebraic complement . . . . . . . . . . . 389E.3 Symmetric idempotent matrices . . . . . . . . . . . . . . . . . 390E.3.1 Four subspaces . . . . . . . . . . . . . . . . . . . . . . 391E.3.2 Orthogonal characterization . . . . . . . . . . . . . . . 392E.3.3 Symmetric idempotence summary . . . . . . . . . . . . 393E.3.4 Orthonormal decomposition . . . . . . . . . . . . . . . 393E.4 Algebra of projection on affine subsets . . . . . . . . . . . . . 396E.5 Projection examples . . . . . . . . . . . . . . . . . . . . . . . 396E.6 Vectorization interpretation, . . . . . . . . . . . . . . . . . . . 403E.6.1 Nonorthogonal projection on a vector . . . . . . . . . . 403E.6.2 Nonorthogonal projection on vectorized matrix . . . . . 403E.6.3 Orthogonal projection on a vector . . . . . . . . . . . . 405E.6.4 Orthogonal projection on a vectorized matrix . . . . . 405E.7 Range/Rowspace interpretation . . . . . . . . . . . . . . . . . 410E.7.1 Projection on vectorized matrices of higher rank . . . . 411E.8 Projection on convex set . . . . . . . . . . . . . . . . . . . . . 414E.8.1 Projection on cone . . . . . . . . . . . . . . . . . . . . 415E.8.2 Easy projections . . . . . . . . . . . . . . . . . . . . . 418E.8.3 Projection on convex set in subspace . . . . . . . . . . 419E.9 Alternating projection . . . . . . . . . . . . . . . . . . . . . . 422E.9.1 Distance and existence . . . . . . . . . . . . . . . . . . 426E.9.2 Feasibility and convergence . . . . . . . . . . . . . . . 426E.9.3 <strong>Optimization</strong> . . . . . . . . . . . . . . . . . . . . . . . 432F MATLAB programs... 435F.1 isedm() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435F.1.1 Subroutines for isedm() . . . . . . . . . . . . . . . . . 435F.2 conic independence . . . . . . . . . . . . . . . . . . . . . . . . 437F.2.1 lp() . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438F.3 Map of the USA . . . . . . . . . . . . . . . . . . . . . . . . . . 439F.3.1 EDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439F.3.2 EDM using ordinal data . . . . . . . . . . . . . . . . . 441

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