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v2010.10.26 - Convex Optimization

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706 APPENDIX E. PROJECTIONTxT ⊥ R(Q)cone(Q)cone(U)PxFigure 162: Nonorthogonal projection of x∈ R 3 on R(U)= R 2 underbiorthogonality condition; id est, Px=UQ T x such that Q T U =I . Anypoint along imaginary line T connecting x to Px will be projectednonorthogonally on Px with respect to horizontal plane constitutingR 2 = aff cone(U) in this example. Extreme directions of cone(U) correspondto two columns of U ; likewise for cone(Q). For purpose of illustration, wetruncate each conic hull by truncating coefficients of conic combination atunity. Conic hull cone(Q) is headed upward at an angle, out of plane ofpage. Nonorthogonal projection would fail were N(Q T ) in R(U) (were Tparallel to a line in R(U)).

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