Fig. 4From: Non-convex block-sparse compressed sensing with coherent tight framesPlot of f(·) (given in (9)) with respect to q from 0.001 to 1 with step size 0.001. One can easily find that the function f(q) obtains its maximum (around 0.5300) at about q=0.16 and its minimum value (around 0.125) at q=1. Besides, when q=0.5 the value of f(q) is around about 0.3969. In other words, f(q)≥f(1) for any q∈(0,1]Back to article page