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v2009.01.01 - Convex Optimization

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v2009.01.01 - Convex Optimization

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LIST OF FIGURES 15<br />

3 Geometry of convex functions 195<br />

60 <strong>Convex</strong> functions having unique minimizer . . . . . . . . . . . 197<br />

61 1-norm ball B 1 from compressed sensing/compressive sampling 201<br />

62 Cardinality minimization, signed versus unsigned variable . . 203<br />

63 Affine function . . . . . . . . . . . . . . . . . . . . . . . . . . 210<br />

64 Supremum of affine functions . . . . . . . . . . . . . . . . . . 212<br />

65 Epigraph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213<br />

66 Gradient in R 2 evaluated on grid . . . . . . . . . . . . . . . . 221<br />

67 Quadratic function convexity in terms of its gradient . . . . . 226<br />

68 Contour plot of real convex function at selected levels . . . . . 230<br />

69 Iconic quasiconvex function . . . . . . . . . . . . . . . . . . . 240<br />

4 Semidefinite programming 245<br />

70 Visualizing positive semidefinite cone in high dimension . . . . 250<br />

71 2-lattice of sensors and anchors for localization example . . . . 283<br />

72 3-lattice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284<br />

73 4-lattice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285<br />

74 5-lattice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286<br />

75 ellipsoids of orientation and eccentricity . . . . . . . . . . . . . 287<br />

76 a 2-lattice solution for localization . . . . . . . . . . . . . . . . 292<br />

77 a 3-lattice solution . . . . . . . . . . . . . . . . . . . . . . . . 292<br />

78 a 4-lattice solution . . . . . . . . . . . . . . . . . . . . . . . . 293<br />

79 a 5-lattice solution . . . . . . . . . . . . . . . . . . . . . . . . 293<br />

80 Measurement lower-bound for cardinality problem . . . . . . . 297<br />

81 Signal dropout . . . . . . . . . . . . . . . . . . . . . . . . . . 301<br />

82 Signal dropout reconstruction . . . . . . . . . . . . . . . . . . 302<br />

83 Simplex with intersecting line problem in compressed sensing . 304<br />

84 Permutation matrix column-norm and column-sum constraint 312<br />

85 max cut problem . . . . . . . . . . . . . . . . . . . . . . . . 319<br />

86 Shepp-Logan phantom . . . . . . . . . . . . . . . . . . . . . . 325<br />

87 MRI radial sampling pattern in Fourier domain . . . . . . . . 330<br />

88 Aliased phantom . . . . . . . . . . . . . . . . . . . . . . . . . 332<br />

89 Neighboring-pixel candidates for estimating gradient . . . . . 334<br />

90 MIT logo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337<br />

91 One-pixel camera . . . . . . . . . . . . . . . . . . . . . . . . . 338

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