tmp = absx-t; tmp = tmp+abstmp2; y = signxtmp;仿照上段代码写关于改进阈值函数hatw_jk=sgnwjk-pλ1+eqwjk-λwjk≥λ 0 wjk＜λ的代码
tmp = abs(w) - plmda + eq(w-lmda); tmp = (tmp + abs(tmp))/2; y = sign(w).*tmp; y(w<lambda) = 0;
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