quad_enet      a full example on how to use basic functionality of the 'elastic_net' function and its methods for the 'quadrupen' package.
quad_lasso     a full example on how to use basic functionality of the 'lasso' function and its methods for the 'quadrupen' package.
quad_breg      a full example on how to use basic functionality of the 'bounded_reg' function and its methods for the 'quadrupen' package.
