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. Author manuscript; available in PMC: 2015 Nov 6.
Published in final edited form as: IEEE Trans Signal Process. 2014 Jan 1;62(1):183–195. doi: 10.1109/TSP.2013.2287685

Fig. 4.

Fig. 4

Mean square error (20 log10 ||x̄ − x||2) as a function of ℓ and SNR, for ν = 1 and ε(5) = 10−6. The figure shows that, as one decreases ε, the approximation to the ℓ1-norm improves.