Q.func                  An auxiliary function in FISTA algorithm
f.func                  Main loss function for quardratic loss
fista.LpS               A function to solve low rank plus sparse model
                        estimation using FISTA algorithm
gradf.func              Gradient function of quardratic loss
nuclear.pen             Nuclear norm penalty for low-rank component
obj.func                Objective function
plot_network            plot sparse component for use igraph and
                        network layout
prox.nuclear.func       Proximal function with nuclear norm penalty
                        updating
prox.sparse.func        Proximal function with l1-norm penalty updating
shrinkage               Shrinkage function for sparse soft-thresholding
shrinkage.lr            Shrinkage function for low-rank
                        soft-thresholding
sparse.pen              L1-norm penalty for sparse component
summary.LSVAR           Summary of LSVAR S3 class
testVAR                 Function to generate a VAR process
