Fig. 1
From: A fast and accurate algorithm for ℓ 1 minimization problems in compressive sampling
The relative ℓ 2 error (the vertical axis with a base 10 logarithmic scale) versus the number of iterations (the horizontal axis) with various ratio of \(\frac {\beta }{\alpha }\). Red circle \(\frac {\beta }{\alpha }=\frac {0.999}{\|A\|^{2}}\), blue square \(\frac {\beta }{\alpha }=\frac {0.999}{2\|A\|^{2}}\), magenta diamond \(\frac {\beta }{\alpha }=\frac {0.999}{4\|A\|^{2}}\)