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v2010.10.26 - Convex Optimization

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A.6. SINGULAR VALUE DECOMPOSITION, SVD 623A = UΣQ T = [u 1 · · · u m ] Σ⎣⎡q T1 .q T n⎤∑⎦ = η σ i u i qiTi=1Σq 2qq 21Q Tq 1q 2 u 2Uu 1q 1Figure 155: Geometrical interpretation of full SVD [271]: Image of circle{x∈ R 2 | ‖x‖ 2 =1} under matrix multiplication Ax is, in general, an ellipse.For the example illustrated, U [u 1 u 2 ]∈ R 2×2 , Q[q 1 q 2 ]∈ R 2×2 .

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