Graph-matrix calculus (GPH), Proximal mapping
gphprox = gph_prox(gph, lambda)
matrix. A function in GPH matrix form.
constant. A positive smoothing parameter.
matrix. The proximal mapping of the function gph, as a GPH matrix.
Computes the proximal mapping of a given GPH function. The proximal mapping is the set of minimizers of the Moreau envelope,
Bryan Gardiner
, University of British Columbia, BC, Canada