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v2007.09.13 - Convex Optimization

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E.10. ALTERNATING PROJECTION 633y 2θC 1 = R 2 +bPby 1C 2 = A = {y | [ 1 1 ]y = 1}Figure 124: From Example E.10.2.0.2 in R 2 , showing von Neumann-stylealternating projection to find feasible point belonging to intersection ofnonnegative orthant with hyperplane. Point Pb lies at intersection ofhyperplane with ordinate axis. In this particular example, the feasible pointfound is coincidentally optimal. Rate of convergence depends upon angle θ ;as it becomes more acute, convergence slows. [124,3]∥ x ∏i − ( ∞ ∏P k )b∥j=1k201816141210864200 5 10 15 20 25 30 35 40 45iFigure 125: Geometric convergence of iterates in norm, forExample E.10.2.0.2 in R 1000 .

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