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v2010.10.26 - Convex Optimization

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4.5. CONSTRAINING CARDINALITY 339m/k76Donoho boundapproximationx > 0 constraintminimize ‖x‖ 1xsubject to Ax = b (518)543m > k log 2 (1+n/k)minimize ‖x‖ 1xsubject to Ax = bx ≽ 0(523)210 0.2 0.4 0.6 0.8 1k/nFigure 100: For Gaussian random matrix A∈ R m×n , graph illustratesDonoho/Tanner least lower bound on number of measurements m belowwhich recovery of k-sparse n-length signal x by linear programming failswith overwhelming probability. Hard problems are below curve, but not thereverse; id est, failure above depends on proximity. Inequality demarcatesapproximation (dashed curve) empirically observed in [23]. Problems havingnonnegativity constraint (dotted) are easier to solve. [122] [123]

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