SLOPE_solver            Sorted L1 solver
admmSolverGroupSLOPE    Alternating direction method of multipliers
coef.grpSLOPE           Extract model coefficients
getGroupID              Get a groupID object
grpSLOPE                Group SLOPE (Group Sorted L-One Penalized
                        Estimation)
lambdaGroupSLOPE        Regularizing sequence for Group SLOPE
predict.grpSLOPE        Obtain predictions
proxGroupSortedL1       Prox for group SLOPE
prox_sorted_L1          Prox for sorted L1 norm
proximalGradientSolverGroupSLOPE
                        Proximal gradient method for Group SLOPE
sigma                   Extract (estimated) noise level
