* $$Z^{*}\left( :,i \right) = \left\{ \begin{array}{cl} {\frac{{||}w_{i}{||} - \lambda}{{||}w_{i}{||}}W_{i},\mspace{000mu}} & {\left. if\mspace{000mu}\lambda < \middle| \right|W_{i}{||},} \\ {0,} & {\mathit{otherwise}.} \\ \end{array} \right.$$  