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v2009.01.01 - Convex Optimization

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568 APPENDIX A. LINEAR ALGEBRA<br />

Σ<br />

q 2<br />

q<br />

q 2<br />

1<br />

Q T<br />

q 1<br />

q 2 u 2<br />

U<br />

u 1<br />

q 1<br />

Figure 131: Geometrical interpretation of full SVD [234]: Image of circle<br />

{x∈ R 2 | ‖x‖ 2 =1} under matrix multiplication Ax is, in general, an ellipse.<br />

For the example illustrated, U ∆ =[u 1 u 2 ]∈ R 2×2 , Q ∆ =[q 1 q 2 ]∈ R 2×2 .

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