if $mu is zero, it is not equal to threshold function for lasso type soft thresholding function how i get soft thresholding how to deduce a soft thresholding function how to use soft thresholding what is the threshold function of a soft threshold how is soft thresholding function derived how to deduce soft threshold function how to find a soft thresholding function what function is used when the soft thresholding operator does not equal 0 how to deduce thresholding how to get a %mu as soft threshold if thresholding operator what is the soft threshold which thresholding operator does you use how to get soft thresholding function how do ymu and a u derived if the thresholding function is positive a how is soft thresholding derived