wdnet: Weighted Directed Network

##
## wdnet: Weighted directed network
## Copyright (C) 2020-2020  Panpan Zhang and Jun Yan
## Jun Yan <jun.yan@uconn.edu>
##
## This file is part of the R package wdnet.
##
## The R package wdnet is free software: You can redistribute it and/or
## modify it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or any later
## version (at your option). See the GNU General Public License at
## <https://www.gnu.org/licenses/> for details.
##
## The R package wdnet is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
##