Lecture 2 Piecewise-linear optimization
1-norm minimization • xˆ∈ Rn is unknown signal, known to be very sparse • we make linear measurements y =Axˆwith A ∈ Rm×n, m < n estimation by ℓ 1-norm minimization: compute estimate by solving minimize kxk 1 subject to Ax =y estimate is signal with smallest ℓ 1-norm, consistent with measurements equivalent LP (variables x, u ∈ Rn)
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